The Pdf From Jh (Red Book)

Front 1

You want to declare an integer variable called myVar and assign it the value 0. How can you accomplish this?

a. declare myVar as 0;

b. myVar = 0;

c. int myVar = 0

d. int myVar = 0;

Back 1

d

Front 2

You need to make a logical comparison where two values must return true in order for your code to execute the correct statement. Which logical operator enables you to achieve this?

a. AND

b. |

c. &

d. &&

Back 2

c, d

Front 3

What kind of result is returned in the condition portion of an if statement?

a. Boolean

b. Integer

c. Double

d. String

Back 3

a

Front 4

If you want to iterate over the values in an array of integers called arrNumbers to perform an action on them, which loop statement enables you to do this?

a. foreach (int number in arrNumbers)
{
}
b. for each (int number in arrNumbers)
{
}
c. for (int i; each i in arrNumbers; i++)
{
}
d. foreach (number in arrNumbers)
{
}

Back 4

a

Front 5

What is the purpose of break; in a switch statement?
a. It causes the program to exit.
b. It causes the code to exit the switch statement.
c. It causes the program to pause.
d. It causes the code to stop executing until the user presses a key on the keyboard.

Back 5

b

Front 6

What are the four basic repetition structures in C#?
a. for, foreach, loop, while
b. loop, while, do-for, for-each
c. for, foreach, while, do-while
d. do-each, while, for, do

Back 6

c

Front 7

How many times will this loop execute?
int value = 0;
do
{
Console.WriteLine (value);
} while (value > 10);
a. 10 times
b. 1 time
c. 0 times
d. 9 times

Back 7

b

Front 8

What are the keywords supported in an if statement?
a. if, else, else-if, return
b. if, else, else if
c. if, else, else if, break
d. if, else, default

Back 8

b

Front 9

In the following code sample, will the second if structure be evaluated?
bool condition = true;

if(condition)
if(5 < 10)
Console.WriteLine("5 is less than 10);
a. Yes
b. No

Back 9

a

Front 10

Which of the following is NOT a comparison operator?
a. !=
b =
c. >
d. <

Back 10

b

Front 11

Which of the following is the correct syntax for executing the following statements in an if statement?
Console.WriteLine("In an if statement");
Console.WriteLine();
a.
bool condition = true;
if(condition)
Console.WriteLine("In an if statement");
Console.WriteLine();
Console.WriteLine("Outside the if statement");
b.
bool condition = true;
if(condition)
{
Console.WriteLine("In an if statement");
Console.WriteLine();
}
Console.WriteLine("Outside the if statement");
c.
bool condition = true;
if(condition)
{
Console.WriteLine("In an if statement");
Console.WriteLine();
Console.WriteLine("Outside the if statement");
}
d.
bool condition = true;
if(condition)
{
Console.WriteLine("In an if statement");
}
Console.WriteLine();
Console.WriteLine("Outside the if statement");

Back 11

b

Front 12

Which of the following looping structures must end with a semicolon?
a. for
b. foreach
c. do-while
d. while

Back 12

c

Front 13

How do you handle multiple switch statements with one condition in a switch structure?
a. Remove the colon after the condition.
b. Enclose all the code statements you want executed together in curly braces.
c. Create separate switch statements.
d. Omit the break; statement.

Back 13

d

Front 14

In a for statement, when does the incrementing of the counter take place?
a. On the last iteration only
b. At the end of each iteration
c. On the second and subsequent iterations only
d. At the end of the iteration and after the comparison

Back 14

b

Front 15

When can you assign a value to a variable?
a. During creation only
b. Only runtime in code
c. During declaration
d. Only at design time when writing the code

Back 15

c

Front 16

How can you tell when a statement has ended in C#?
a. Using the end of line character
b. Using the carriage return character
c. Using the colon
d. Using the semicolon

Back 16

d

Front 17

What is a declaration statement used for in C#?
a. To declare a variable name
b. To declare a variable name and data type
c. To declare the beginning of program execution
d. To declare the beginning of a function

Back 17

b

Front 18

Which of these is not a valid C# statement?
a. ;
b. int myVar;
c. string string;
d. Console.WriteLine("Hello world");

Back 18

c

Front 19

What is one common characteristic of complex statements?
a. They contain only complex statements.
b. They enclose statements on curly braces.
c. They enclose statements in parentheses.
d. They use tabs and other white space to tell the compiler where statements start and end.

Back 19

b

Front 20

In a complex if, else if structure, what keyword can be used to denote the final condition?
a. end if
b. endif
c. default
d. else

Back 20

d

Front 21

What is the maximum value you can store in an int data type?
a. Positive infinity
b. 32,167
c. 65,536
d. 4,294,967,296

Back 21

d

Front 22

True or false: Double and float data types can store values with decimals.

Back 22

true

Front 23

Which declaration can assign the default value to an int type?
a. new int();
b. int myInt = new int();
c. int myInt;
d. int myInt = new int(default);

Back 23

b

Front 24

True or false: structs can contain methods.

Back 24

true

Front 25

What is the correct way to access the firstName property of a struct named Student?
a. string name = Student.firstName;
b. string name = Student.firstName();
c. string name = Student(firstName);
d. string name = Student.(firstName);

Back 25

a

Front 26

In the following enumeration, what will be the underlying value of Wed?
enum Days {Mon = 1, Tue, Wed, Thur, Fri, Sat, Sun};
a. 2
b. 3
c. 4
d. It has no numeric value.

Back 26

b

Front 27

What are two methods with the same name but with different parameters?
a. Overloading
b. Overriding
c. Duplexing
d. Duplicate

Back 27

a

Front 28

What is the parameter in this method known as?
public void displayAbsoluteValue(int value = 1)
a. Modified
b. Optional
c. Named
d. Default

Back 28

b

Front 29

When you create an abstract method, how do you use that method in a derived class?
a. You must overload the method in your derived class.
b. You must override the method in your derived class.
c. Abstract methods cannot be used in derived classes.
d. You need to declare the method as virtual in your derived class.

Back 29

b

Front 30

How do you enforce encapsulation on the data members of your class?
a. Create private data members.
b. Create private methods.
c. Use public properties.
d. Use private properties.
e. Use the protected access modifier on methods, properties, and member variables.

Back 30

a, c

Front 31

Boxing refers to:
a. Encapsulation
b. Converting a value type to a reference type
c. Converting a reference type to a value type
d. Creating a class to wrap functionality in a single entity

Back 31

b

Front 32

What is one advantage of using named parameters?
a. You can pass the arguments in to the method in any order using the parameter names.
b. You can pass in optional arguments as long as you use the parameter names in your arguments.
c. Named parameters make compiling much faster.
d. Name parameters do not affect compile time.

Back 32

a

Front 33

What is an advantage of using generics in .NET?
a. Generics enable you to create classes that span types.
b. Generics enable you to create classes that accept the type at creation time.
c. Generics perform better than nongeneric classes.
d. Generics do not use optional parameters.

Back 33

b

Front 34

What does the designator indicate in a generic class?
a. It is the parameter for all arguments passed in to the class constructor.
b. It is the parameter designator for the default method of the class.
c. It is a placeholder that will contain the object type used.
d. It is a placeholder that will serve as the class name.

Back 34

c

Front 35

How are the values passed in generic methods?
a. They are passed by value.
b. They are passed by reference.
c. They must be encapsulated in a property.
d. They are passed during class instantiation.

Back 35

b

Front 36

You want to create a type in your code that stores multiple values of differing types but don’t need the full facilities of a class file. What is the value type that can serve your needs?
a. Array
b. Struct
c. Queue
d. Linked List

Back 36

b

Front 37

You can change the increment of Enumerations. True or false?

Back 37

false

Front 38

Overloading a method can be accomplished by changing only the order of the parameters. True or false?

Back 38

false

Front 39

Optional parameters in a method must exist where in the parameter list?
a. At the beginning
b. At the end
c. After any default parameters
d. Anywhere

Back 39

b

Front 40

What modifier is used on the properties of a class?
a. Private
b. Static
c. Public
d. Property

Back 40

c

Front 41

To parse a string that might contain a currency value such as $1,234.56, you should pass the Parse or TryParse method which of the following values?
a. NumberStyles.AllowCurrencySymbol
b. NumberStyles.AllowThousands
c. NumberStyles.Currency
d. A combination of all NumberStyles values

Back 41

c

Front 42

Which of the following statements is true for widening conversions?
a. Any value in the source type can fit into the destination type.
b. The conversion will not result in loss of magnitude but may result is some loss of precision.
c. An explicit cast is optional.
d. All of the above.

Back 42

d

Front 43

Which of the following statements is true for narrowing conversions?
vThe conversion will not result in loss of magnitude but may result is some loss of precision.
b. The source and destination types must be compatible.
c. An explicit cast is optional.
d. A cast can convert a string into an int if the string holds numeric text.

Back 43

b

Front 44

Assuming total is a decimal variable holding the value 1234.56, which of the following statements displays total with the currency format $1,234.56?
a. Console.WriteLine(total.ToString());
b. Console.WriteLine(total.ToCurrency
String());
c. Console.WriteLine(total.ToString
("c"));
d. Console.WriteLine(Format("{0:C}",
total);

Back 44

c

Front 45

Which of the following statements generates a string containing the text "Veni, vidi, vici"?
a. String.Format("{0}, {1}, {2}",
Veni, vidi, vici)
b. String.Format("{1}, {2}, {3}",
"Veni", "vidi", "vici")
c. String.Format("{2}, {0}, {3}",
"vidi", "Venti", "Veni", "vici")
d. String.Format("{Veni, vidi, vici}")

Back 45

c

Front 46

If i is an int and l is a long, which of the following statements is true?
a. i = (int)l is a narrowing conversion.
b. l = (long)i is a narrowing conversion.
c. l = (long)i could cause an integer overflow.
d. The correct way to copy i’s value into l is
l = long.Parse(i).

Back 46

a

Front 47

Which of the following methods is the best way to store an integer value typed by the user in a variable?
a. ToString
b. Convert
c. ParseInt
d. TryParse

Back 47

d

Front 48

The statement object obj = 72 is an example of which of the following?
a. Explicit conversion
b. Immutable conversion
c. Boxing
d. Unboxing

Back 48

c

Front 49

If Employee inherits from Person and Manager inherits from Employee, which of the following statements is valid?
a. Person alice = new Employee();
b. Employee bob = new Person();
c. Manager cindy = new Employee();
d. Manager dan = (Manager)
(new Employee());

Back 49

a

Front 50

Which of the following is not a String method?
a. IndexOf
b. StartsWith
c. StopsWith
d. Trim

Back 50

c

Front 51

Which of the following techniques does not create a String containing 10 spaces?
a. Set a String variable equal to a literal containing 10 spaces.
b. Use a String constructor passing it an array of 10 space characters.
c. Use a String constructor passing it the space character and 10 as the number of times it should be repeated.
d. Use the String class’s Space method passing it 10 as the number of spaces the string should contain.

Back 51

d

Front 52

Which of the following statements can you use to catch integer overflow and underflow errors?
a. checked
b. overflow
c. watch
d. try

Back 52

a

Front 53

Which of the following techniques should you use to watch for floating point operations that cause overflow or underflow?
a. Use a checked block.
b. Use a try-catch block.
c. Check the result for the value Infinity or NegativeInfinity.
d. Check the result for Error.

Back 53

c

Front 54

Which of the following are narrowing conversions?
a. Converting a byte to an integer
b. Converting a double to a float
c. Converting an integer to a long
d. Converting a float to a double
e. Converting an integer to a float
f. Converting a double to a long
g. Converting a decimal to an integer
h. Converting an integer to a decimal

Back 54

b, f, g

Front 55

Which of the following are widening conversions?
a. Converting a byte to an integer
b. Converting a double to a float
c. Converting an integer to a long
d. Converting a float to a double
e. Converting an integer to a float
f. Converting a double to a long
g. Converting a decimal to an integer
h. Converting an integer to a decimal

Back 55

a, c, d, e, h

Front 56

If the Manager class inherits from the Employee class, and the Employee and Customer classes both inherit from the Person class, then which of the following are narrowing conversions?
a. Converting a Person to a Manager
b. Converting an Employee to a Manager
c. Converting an Employee to a Person
d. Converting a Manager to a Person
e. Converting a Manager to an Employee
f. Converting a Person to an Employee
g. Converting a Customer to an Employee
h. Converting an Employee to a Customer

Back 56

a, b, f . (In a sense you could technically consider g and h to be considered narrowing conversions, but actually they are just invalid conversions.)

Front 57

If the Manager class inherits from the Employee class, and the Employee and Customer classes both inherit from the Person class, then which of the following are widening conversions?
a. Converting a Person to a Manager
b. Converting an Employee to a Manager
c. Converting an Employee to a Person
d. Converting a Manager to a Person
e. Converting a Manager to an Employee
f. Converting a Person to an Employee
g. Converting a Customer to an Employee
h. Converting an Employee to a Customer

Back 57

c, d, e

Front 58

During which of the following conversions might there be a loss of precision?
a. Converting an int to a float
b. Converting a float to a long
c. Converting a long to an int
d. Converting an int to a long
e. Converting a float to a decimal
f. Converting a decimal to a float

Back 58

a, b, e, f

Front 59

Suppose the Customer class inherits from the Person class, cust is a Customer variable that holds a reference to a Customer object, and person is a Person variable that holds a reference to a Person object. Then which of the following statements will fail at design time?
a. cust = person;
b. cust = person as Customer;
c. cust = (Customer)person;
d. person = cust;
e. person = cust as Person;
f. person = (Person)cust;

Back 59

a

Front 60

Suppose the Customer class inherits from the Person class, cust is a Customer variable that holds a reference to a Customer object, and person is a Person variable that holds a reference to a Person object. Then which of the following statements will fail at run time?
a. cust = person;
b. cust = person as Customer;
c. cust = (Customer)person;
d. person = cust;
e. person = cust as Person;
f. person = (Person)cust;

Back 60

c

Front 61

Which of the following methods enables a program to parse an integer entered in a TextBox by the user?
a. int.Parse
b. int.TryParse
c. string.Parse
d. string.ParseInt
e. System.Convert.ToInt32

Back 61

a, b, e

Front 62

Which of the following string methods breaks a delimited string into pieces?
a. ToArray
b. Split
c. Fields
d. Join

Back 62

b

Front 63

Which of the following string methods combines an array of values into a single delimited string?
a. FromArray
b. Fields
c. Join
d. Merge

Back 63

c

Front 64

Which of the following statements correctly casts a float into an int?
a. int value = (float)fvalue
b. int value = (int)fvalue
c. int value = ToInt(fvalue)
d. float value = (int)fvalue

Back 64

b

Front 65

Which of the following methods does not convert a floating point value into an integer type value?
a. Convert.ChangeType
b. Convert.ToInt16
c. Convert.ToInt32
d. Type.ToInt32

Back 65

d

Front 66

Which of the following methods lets you retrieve four 16-bit values that are packed into a 64-byte value returned by an API function?
a. BitConverter.ToInt
b. BitConverter.FromInt64
c. (int)
d. BitConverter.ToInt16

Back 66

d

Front 67

Which of the following methods converts a 32-bit integer value into an array of bytes?
a. BitConverter.ToBytes
b. BitConverter.GetBytes
c. BitConverter.ToArray
d. ToArray

Back 67

b

Front 68

In the following two statements, where does boxing occur?
int i = 1337;
Console.WriteLine(string.Format("i is: {0}", i));
a. Storing 1337 in an int requires that 1337 be boxed.
b. The string.Format method must box its first parameter.
c. The string.Format method must box its second parameter.
d. The Console.WriteLine method must box the result of the string.Format method.

Back 68

c

Front 69

After executing the following two C# statements, which of the following is true?
int i = 10;
object iObject = i;
a. Variable i holds the value 10.
b. Variable iObject holds the value 10.
c. If you later change the value of iObject, the value of i remains unchanged.
d. All the above.

Back 69

d

Front 70

When working with API functions, a variable with a name that begins with lpsz has what data type?
a. String
b. 32-bit integer
c. Character array
d. Boolean

Back 70

a

Front 71

What purpose does a dynamic data type serve?
a. It enables the program to store more than one kind of data in a variable.
b. It enables the program to convert a value from one type to another automatically without casting.
c. It enables Visual Studio to defer type checking until run time.
d. It prevents type checking.

Back 71

c

Front 72

Which of the following methods formats the variable amount as currency?
a. value.ToString("C")
b. value.ToString("$")
c. value.ToString("$#,###.00")
d. value.ToCurrency()

Back 72

a

Front 73

Which of the following methods converts the current date into a string that is appropriate for the user’s locale?
a. DateTime.Now.ToString("mm/dd/yy")
b. DateTime.Now.ToString("D")
c. DateTime.Now.ToString("d")
d. DateTime.Now.ToShortDateString()

Back 73

b, c, d

Front 74

Which the following statements about the base keyword is false?
a. A constructor can use at most one base statement.
b. A constructor cannot use both a base statement and a this statement.
c. The base keyword lets a constructor invoke a different constructor in the same class.
d. If a constructor uses a base statement, its code is executed after the invoked constructor is executed.

Back 74

c

Front 75

Which the following statements about the this keyword is false?
a. A constructor can use at most one this statement.
b. A constructor can use a this statement and a base statement if the base statement comes first.
c. The this keyword lets a constructor invoke a different constructor in the same class.
d. If a constructor uses a this statement, its code is executed after the invoked constructor is executed.

Back 75

b

Front 76

Suppose you have defined the House and Boat classes and you want to make a HouseBoat class that inherits from both House and Boat. Which of the following approaches would not work?
a. Make HouseBoat inherit from both House and Boat.
b. Make HouseBoat inherit from House and implement an IBoat interface.
c. Make HouseBoat inherit from Boat and implement an IHouse interface.
d. Make HouseBoat implement both IHouse and IBoat interfaces.

Back 76

a

Front 77

Suppose the HouseBoat class implements the IHouse interface implicitly and the IBoat interface explicitly. Which of the following statements is false?
a. The code can use a HouseBoat object to access its IHouse members.
b. The code can use a HouseBoat object to access its IBoat members.
c. The code can treat a HouseBoat object as an IHouse to access its IHouse members.
d. The code can treat a HouseBoat object as an IBoat to access its IBoat members.

Back 77

b

Front 78

Which of the following is not a good use of interfaces?
a. To simulate multiple inheritance.
b. To allow the code to treat objects that implement the interface polymorphically as if they were of the interface’s “class.”
c. To allow the program to treat objects from unrelated classes in a uniform way.
d. To reuse the code defined by the interface.

Back 78

d

Front 79

Suppose you want to make a Recipe class to store cooking recipes and you want to sort the Recipes by the MainIngredient property. In that case, which of the following interfaces would probably be most useful?
a. IDisposable
b. IComparable
c. IComparer
d. ISortable

Back 79

b

Front 80

Suppose you want to sort the Recipe class in question 6 by any of the properties MainIngredient, TotalTime, or CostPerPerson. In that case, which of the following interfaces would probably be most useful?
a. IDisposable
b. IComparable
c. IComparer
d. ISortable

Back 80

c

Front 81

Which of the following statements is true?
a. A class can inherit from at most one class and implement at most one interface.
b. A class can inherit from any number classes and implement any number of interfaces.
c. A class can inherit from at most one class and implement any number of interfaces.
d. A class can inherit from any number of classes and implement at most one interface.

Back 81

c

Front 82

A program can use the IEnumerable and IEnumerator interfaces to do which of the following?
a. Use MoveNext and Reset to move through a list of objects.
b. Use foreach to move through a list of objects.
c. Move through a list of objects by index.
d. Use the yield return statement to make a list of objects for iteration.

Back 82

a

Front 83

Which of the following statements about garbage collection is false?
a. In general, you can’t tell when the GC will perform garbage collection.
b. It is possible for a program to run without ever performing garbage collection.
c. An object’s Dispose method can call GC.SuppressFinalize to prevent the GC from calling the object’s destructor.
d. Before destroying an object, the GC calls its Dispose method.

Back 83

d

Front 84

Which of the following statements about destructors is false?
a. Destructors are called automatically.
b. Destructors cannot assume that other managed objects exist while they are executing.
c. Destructors are inherited.
d. Destructors cannot be overloaded.

Back 84

c

Front 85

If a class implements IDisposable, its Dispose method should do which of the following?
a. Free managed resources.
b. Free unmanaged resources.
c. Call GC.SuppressFinalize.
d. All of the above.

Back 85

d

Front 86

If a class has managed resources and no unmanaged resources, it should do which of the following?
a. Implement IDisposable and provide a destructor.
b. Implement IDisposable and not provide a destructor.
c. Not implement IDisposable and provide a destructor.
d. Not implement IDisposable and not provide a destructor.

Back 86

b

Front 87

If a class has unmanaged resources and no managed resources, it should do which of the following?
a. Implement IDisposable and provide a destructor.
b. Implement IDisposable and not provide a destructor.
c. Not implement IDisposable and provide a destructor.
d. Not implement IDisposable and not provide a destructor.

Back 87

a

Front 88

1. What keyword do you use to make a constructor invoke a base class constructor?
a. base
b. mybase
c. MyBase
d. this
e. parent
f. constructor

Back 88

a

Front 89

2. What keyword do you use to make a constructor invoke a different constructor in the same class?
a. base
b. mybase
c. MyBase
d. this
e. parent
f. constructor

Back 89

d

Front 90

3. Suppose the Person class provides two constructors that do different things and you derive the Student class from Person. Suppose you want to make a Student constructor that does what both of the Person constructors do. Which of the following strategies would give you this result?
a. Use multiple base clauses.
b. Move the tasks performed by the Person constructors into methods and invoke them from the Student constructor.
c. Make a third Person constructor that invokes the other two Person constructors. Then have the Student constructor invoke the new Person constructor.
d. Move the tasks performed by the Person constructors into methods, and make a third Person constructor that invokes those methods. Then have the Student constructor invoke the new Person constructor.

Back 90

b, d

Front 91

4. Suppose you have created Boat and Car classes, and you want to make an AquaticCar class. Which of the following approaches would work?
a. Make AquaticCar inherit from both Boat and Car.
b. Make AquaticCar inherit from Boat and implement an ICar interface.
c. Make AquaticCar inherit from Car and implement an IBoat interface.
d. Make AquaticCar implement ICar and IBoat interfaces.

Back 91

b, c, d

Front 92

5. Suppose you have created a Boat class that contains several hundred lines of code and a Car class that contains only a few dozen lines of code. Now suppose you want to make an AquaticCar class. Rank the following approaches so that the best approach comes first.
a. Make AquaticCar inherit from both Boat and Car.
b. Make AquaticCar inherit from Boat and implement an ICar interface.
c. Make AquaticCar inherit from Car and implement an IBoat interface.
d. Make AquaticCar implement ICar and IBoat interfaces.

Back 92

b, c, d

Front 93

6. Suppose you’re building a network application. The Node and Link classes represent a network’s nodes and connecting links. Assuming both of those classes use managed resources, which of the following tasks should the classes do to manage those resources?
a. Implement IDisposable.
b. Provide a Dispose method.
c. Provide a destructor.
d. Implement a Finalize method.

Back 93

a, b

Front 94

7. Suppose the Polygon class uses managed resources. Which of the following tasks should the class do to manage its resources?
a. Implement IDisposable.
b. Provide a Dispose method.
c. Provide a destructor.
d. Implement a Finalize method.

Back 94

a, b

Front 95

8. Suppose the PriceData class uses unmanaged resources. Which of the following tasks should the class do to manage its resources?
a. Implement IDisposable.
b. Provide a Dispose method.
c. Provide a destructor.
d. Implement a Finalize method.

Back 95

a, b, c

Front 96

9. After freeing resources, which of the following should the Dispose method do?
a. Call GC.Finalize.
b. Call GC.SuppressFinalize.
c. Set GC.Finalize = false.
d. Call the object’s destructor.

Back 96

b

Front 97

10. Under which of the following circumstances should a program not call an object’s Dispose method?
a. The object was initialized in a using statement.
b. The object has no Dispose method.
c. The object implements IDisposable.
d. The program invoked the object’s destructor.

Back 97

a, b

Front 98

11. If you make a Person class and a Student class with the obvious inheritance relationship, then the Person class is which of the following?
a. A derived class
b. A parent class
c. A child class
d. A subclass
e. A superclass

Back 98

b, e

Front 99

12. If you make a Person class and a Student class with the obvious inheritance relationship, then the Student class is which of the following?
a. A derived class
b. A parent class
c. A child class
d. A subclass
e. A superclass

Back 99

a, c, d

Front 100

13. If you define a class, how many parent classes can you define for it?
a. 0
b. 1
c. 2
d. Any number

Back 100

a, b

Front 101

14. If you define a class, how many child classes can you define for it?
a. 0
b. 1
c. 2
d. Any number

Back 101

d

Front 102

15. If you define a class, what is the maximum number of interfaces that it can implement?
a. 0
b. 1
c. 2
d. Any number

Back 102

d

Front 103

16. If you define an interface, what is the maximum number of classes that can implement it?
a. 0
b. 1
c. 2
d. Any number

Back 103

d

Front 104

17. Suppose the IStudent interface defines the method PrintGrades. If the TeachingAssistant class explicitly implements the interface, then which of the following statements is true?
a. TeachingAssistant has a method named PrintGrades.
b. TeachingAssistant has a method named IStudent.PrintGrades.
c. If ta is a TeachingAssistant variable, then the program can call ta.PrintGrades().
d. If ta is a TeachingAssistant variable, then the program can call ta.IStudent.PrintGrades().
e. If ta is an IStudent variable, then the program can call ta.PrintGrades().
f. If ta is an IStudent variable, then the program can call ta.IStudent.PrintGrades().

Back 104

b, e

Front 105

18. Suppose the IStudent interface defines the method PrintGrades. If the TeachingAssistant class implicitly implements the interface, then which of the following statements is true?
a. TeachingAssistant has a method named PrintGrades.
b. TeachingAssistant has a method named IStudent.PrintGrades.
c. If ta is a TeachingAssistant variable, then the program can call ta.PrintGrades().
d. If ta is a TeachingAssistant variable, then the program can call ta.IStudent.PrintGrades().
e. If ta is an IStudent variable, then the program can call ta.PrintGrades().
f. If ta is an IStudent variable, then the program can call ta.IStudent.PrintGrades().

Back 105

a, c, e

Front 106

19. The Array.Sort method can sort an array of objects if their class implements which of the following interfaces?
a. IComparer
b. IComparable
c. ISortable
d. IEquatable

Back 106

b

Front 107

20. A List object’s Contains method returns true if a particular object is in the List but only if the object’s class implements which method?
a. IComparer
b. IComparable
c. ISortable
d. IEquatable

Back 107

d

Front 108

Which of the following is a valid delegate definition?
a. private delegate float MyDelegate(float);
b. private delegate MyDelegate(x);
c. private delegate MyDelegate(float x);
d. private delegate void MyDelegate(float x);

Back 108

d

Front 109

Which of the following statements is not true of delegate variables?
a. You need to use a cast operator to execute the method to which a delegate variable refers.
b. A struct or class can contain fields that are delegate variables.
c. You can make an array or list of delegate variables.
d. You can use addition to combine delegate variables into a series of methods and use subtraction to remove a method from a series.

Back 109

a

Front 110

If the Employee class inherits from the Person class, covariance lets you do which of the following?
a. Store a method that returns a Person in a delegate that represents methods that return an Employee.
b. Store a method that returns an Employee in a delegate that represents methods that return a Person.
c. Store a method that takes a Person as a parameter in a delegate that represents methods that take an Employee as a parameter.
d. Store a method that takes an Employee as a parameter in a delegate that represents methods that take a Person as a parameter.

Back 110

b

Front 111

If the Employee class inherits from the Person class, contravariance lets you do which of the following?
a. Store a method that returns a Person in a delegate that represents methods that return an Employee.
b. Store a method that returns an Employee in a delegate that represents methods that return a Person.
c. Store a method that takes a Person as a parameter in a delegate that represents methods that take an Employee as a parameter.
d. Store a method that takes an Employee as a parameter in a delegate that represents methods that take a Person as a parameter.

Back 111

c

Front 112

In the variable declaration Action processor, the variable processor represents which of the following?
a. Methods that take no parameters and return an Order object.
b. Methods that take an Order object as a parameter and return void.
c. Methods that take an Order object as a parameter and return an Order object.
d. Methods provided by the Action class that take no parameters and return void.

Back 112

b

Front 113

In the variable declaration Func processor, the variable processor represents which of the following?
a. Methods that take no parameters and return an Order object.
b. Methods that take an Order object as a parameter and return void.
c. Methods that take an Order object as a parameter and return an Order object.
d. Methods provided by the Action class that take no parameters and return void.

Back 113

a

Front 114

Suppose F is declared by the statement Func F. Then which of the following correctly initializes F to an anonymous method?
a. F = (float x) { return x * x; };
b. F = delegate { return x * x; };
c. F = float Func(float x) { return x * x; };
d. F = delegate(float x) { return x * x; };

Back 114

d

Front 115

Suppose the variable note is declared by the statement Action note. Then which of the following correctly initializes note to an expression lambda?
a. note = { return x * x; };
b. note = () { return x * x; };
c. note = () => MessageBox.Show("Hi");
d. note = MessageBox.Show("Hi");

Back 115

c

Front 116

Suppose the variable result is declared by the statement Func result. Which of the following correctly initializes result to an expression lambda?
a. result = (float x) => x * x;
b. result = (x) => return x * x;
c. result = x => x * x;
d. Both a and c are correct.

Back 116

d

Front 117

Which of the following statements about statement lambdas is false?
a. A statement lambda can include more than one statement.
b. A statement lambda cannot return a value.
c. A statement lambda must use braces, { }.
d. If a statement lambda returns a value, it must use a return statement.

Back 117

b

Front 118

Suppose the MovedEventHandler delegate is defined by the statement delegate void MovedEventHandler(). Which of the following correctly declares the Moved event?
a. public MovedEventHandler MovedEvent;
b. public event MovedEventHandler MovedEvent;
c. public event Action MovedEvent;
d. Both b and c are correct.

Back 118

d

Front 119

Suppose the Employee class is derived from the Person class and the Person class defines an AddressChanged event. Which of the following should you not do to allow an Employee object to raise this event?
a. Create an OnAddressChanged method in the Person class that raises the event.
b. Create an OnAddressChanged method in the Employee class that raises the event.
c. Make the Employee class call OnAddressChanged as needed.
d. Make the code in the Person class that used to raise the event call the OnAddressChanged method instead.

Back 119

b

Front 120

Which of the following statements subscribes the myButton_Click event handler to catch the myButton control’s Click event?
a. myButton.Click += myButton_Click;
b. myButton_Click += myButton.Click;
c. myButton_Click handles myButton.Click;
d. myButton.Click = myButton_Click;

Back 120

a

Front 121

Suppose the Car class provides a Stopped event that takes as parameters sender and StoppedArgs objects. Suppose also that the code has already created an appropriate StoppedArgs object named args. Then which of the following code snippets correctly raises the event?
a. if (!Stopped.IsEmpty) Stopped(this, args);
b. if (Stopped) Stopped(this, args);
c. if (Stopped != null) Stopped(this, args);
d. raise Stopped(this, args);

Back 121

c

guys, we think b may also work.

What do you think? I know c is the standard.

Front 122

Which of the following statements about events is false?
a. If an object subscribes to an event twice, its event handler executes twice when the event is raised.
b. If an object subscribes to an event twice and then unsubscribes once, its event handler executes once when the event is raised.
c. If an object subscribes to an event once and then unsubscribes twice, its event handler throws an exception when the event is raised.
d. In a Windows Forms application, you can use the Properties window to subscribe and unsubscribe events, and to create empty event handlers.

Back 122

c

Front 123

Which of the following statements about inheritance and events is false?
a. A derived class can raise a base class event by using code similar to the following:
if (base.EventName != null) base.EventName(this, args);
b. A derived class cannot raise an event defined in an ancestor class.
c. A class can define an OnEventName method that raises an event to allow derived classes to raise that event.
d. A derived class inherits the definition of the base class’s events, so a program can subscribe to a derived object’s event.

Back 123

a

Front 124

Which of the following statements about exception handling is true?
a. You can nest a try-catch-finally block inside a try, catch, or finally section.
b. A try-catch-finally block must include at least one catch section and one finally section.
c. An exception is handled by the catch section that has the most specific matching exception type.
d. The code in a finally section executes if the code finishes without an error or if a catch section handles an exception but not if the code executes a return statement.

Back 124

a

Front 125

Which of the following methods can you use to catch integer overflow exceptions?
a. Use a try-catch-finally block.
b. Use a checked block and a try-catch-finally block.
c. Check the Advanced Build Settings dialog’s overflow/underflow box, and use a try-catch-finally block.
d. Either b or c.

Back 125

d

Front 126

Which of the following returns true if variable result holds the value float.PositiveInfinity?
a. result == float.PositiveInfinity
b. float.IsInfinity(result)
c. float.IsPositiveInfinity(result)
d. All of the above.

Back 126

d

Front 127

Which of the following statements about throwing exceptions is false?
a. If you catch an exception and throw a new one to add more information, you should include the original exception in the new one’s InnerException property.
b. If you rethrow the exception ex with the statement throw, the exception’s call stack is reset to start at the current line of code.
c. If you rethrow the exception ex with the statement throw ex, the exception’s call stack is reset to start at the current line of code.
d. Before a method throws an exception, it should clean up as much as possible, so the calling code has to deal with the fewest possible side effects.

Back 127

b

Front 128

Which of the following should you not do when building a custom exception class?
a. Derive it from the System.Exception class, and end its name with Exception.
b. Give it event handlers with parameters that match those defined by the System.Exception class.
c. Make it implement IDisposable.
d. Give it the Serializable attribute.

Back 128

c

Front 129

Which of the following statements creates a delegate type named MyFunc that represents a method that takes a parameter that is an array of decimal values and returns a decimal result?
a. delegate decimal(decimal[] values) MyFunc
b. delegate decimal MyFunc(decimal values[])
c. delegate decimal[] MyFunc(decimal values)
d. delegate decimal MyFunc(decimal[] values)

Back 129

d

Front 130

If rate is a delegate variable that takes a float parameter and returns a float result, which of the following statements will work assuming x is a float variable?
a. int y = rate(x)
b. float y = rate(x)
c. rate(y, x)
d. double y = rate(x)

Back 130

b, d

Front 131

If rate is a delegate variable that refers to the method Rate, then what is the practical difference between calling rate or Rate?
a. You can omit the parameters when calling rate.
b. You must save the result of rate into a variable, but you can use the result of Rate in an expression.
c. You can save Rate in another delegate variable, but you cannot save rate in another delegate variable.
d. There is no practical difference.

Back 131

d

Front 132

Which of the following can you do with delegate variables?
a. Make a generic List containing delegate values.
b. Make an array containing delegate values.
c. Use + to add two delegate variables to create a third that represents executing the other two in sequence.
d. Pass the result of executing one delegate variable as a parameter to another delegate variable.

Back 132

a, b, c, d

Front 133

Which of the following statements about delegates is true?
a. You can only set a delegate variable equal to a static method.
b. If you set a delegate variable equal to an instance method, then you must set it equal to a specific object’s instance of a method.
c. If you set a delegate variable equal to an instance method, then it executes in the context of the specific object for which it was created.
d. You can set a delegate variable equal to an instance method and then later set it equal to a static method.

Back 133

b, c, d

Front 134

Which of the following is a built-in delegate type that represents a method that returns void?
a. Method
b. Static
c. Action
d. Act

Back 134

c

Front 135

Which of the following is a built-in delegate type that represents a method that returns a value?
a. Function
b. Func
c. Returns
d. Action

Back 135

b

Front 136

If variable note is declared as a delegate variable that takes no parameters and returns no value, which of the following statements could you use to initialize note?
a. note = () => MessageBox.Show("Hi");
b. note = MessageBox.Show("Hi");
c. note(string) = () MessageBox.Show(string);
d. note(s) = () => MessageBox.Show(s);

Back 136

a

Front 137

If variable note is declared as a delegate variable that takes a string parameter and returns no value, which of the following statements could you use to initialize note?
a. note = () => MessageBox.Show(string);
b. note = () => MessageBox.Show("Hi");
c. note = (s) => MessageBox.Show(s);
d. note = (string a) => MessageBox.Show(s);

Back 137

c, d

Front 138

Which of the following statements about expression lambdas is true?
a. The lambda’s code must be a single C# statement.
b. The lambda can return a value by simply evaluating an expression as in x * x (hence the name expression lambda).
c. The lambda can return a value by using a return statement.
d. The lambda’s code must be enclosed in braces.
e. The lambda must return a value.

Back 138

a, b

Front 139

Which of the following statements about statement lambdas is true?
a. The lambda’s code must be a single C# statement.
b. The lambda can return a value by simply evaluating an expression as in x * x.
c. The lambda can return a value by using a return statement.
d. The lambda’s code must be enclosed in braces.
e. The lambda must return a value.

Back 139

c, d

Front 140

Which of the following correctly declares a variable notify so that it can hold a reference to a method that takes no parameters and returns no result?
a. Action notify;
b. Action notify;
c. Action<> notify;
d. void notify();

Back 140

a

Front 141

Which of the following correctly declares a variable fxy so that it can hold a reference to a method that takes two floats as parameters and returns a float result?
a. Func fxy(float, float);
b. Func float fxy(float, float);
c. Func fxy;
d. float fxy(float, float);

Back 141

c

Front 142

When you declare an event, which of the following is always required?
a. The public keyword
b. The event keyword
c. The event’s name
d. A parameter list

Back 142

c

guys we think it may need to be b also.

What do you think?

Front 143

When you define an event, Microsoft recommends which of the following?
a. The event handler’s first parameter should be the object raising the event.
b. The event handler’s second parameter should an object of a class derived from EventArgs.
c. The event handler’s third parameter should provide additional information about the event.
d. The name of the second parameter’s class should be the event’s name followed by EventArgs.

Back 143

a, b, d

Front 144

If you have defined an appropriate LostEventType delegate type and the LostEventArgs class, which of the following statements could you use to declare the Lost event?
a. event LostEventType Lost;
b. EventHandler Lost;
c. EventHandler Lost;
d. Action Lost;

Back 144

a, b, d

Front 145

The finally section in a try-catch-finally block executes under which of the following conditions?
a. The code executes without any exceptions.
b. The code throws an exception and a catch section catches it.
c. The code throws an exception and no catch section catches it.
d. The code executes without any exceptions and executes a return statement.
e. The code throws an exception, a catch section catches it, and that catch section executes a return statement.
f. The code throws an exception, a catch section catches it, and that catch section’s code throws an exception.

Back 145

a, b, c, d, e, f

Front 146

If a try-catch-finally block’s catch section throws an exception, which of the following might occur (if the appropriate code is in place)?
a. The block’s finally section executes.
b. A catch section in a method higher up the call stack catches the new exception.
c. Another catch section in the try-catch-finally block catches the exception.
d. The program crashes.

Back 146

a, b, d

Front 147

In a try-catch-finally block, the catch sections are examined in which order?
a. The catch sections with the most specific or derived exception class are examined first.
b. The catch sections’ exception classes are considered in alphabetical order.
c. The catch sections’ exception classes are considered in priority order.
d. The catch sections’ exception classes are considered in numeric order.
e. The catch sections are considered in the order in which they appear in the code.

Back 147

e

Front 148

Which of the following could happen after a catch section executes (assuming the appropriate code is in place)?
a. The next catch section executes if appropriate.
b. The finally section executes.
c. The program resumes execution after the try-catch-finally block.
d. The try section executes again.

Back 148

b, c

Front 149

Which of the following constructs could you use to make a particular piece of code to execute repeatedly until it succeeds?
a. A while loop containing a try-catch-finally block
b. A try-catch-finally block with a while loop in the try section
c. A try-catch-finally block with a while loop in a catch section
d. A try-catch-finally block that contains a catch-while section

Back 149

a

Front 150

You are a developer at company xyx. You have been asked to improve the responsiveness of your WPF application. Which solution best fits the requirements?
a. Use the BackgroundWorker class.
b. Use the LongRunningMethod class.
c. Run the method in the UI thread.
d. Use the WorkInBackground class.
e. None of the above.

Back 150

a

Front 151

How do you execute a method as a task?
a. Create a new Task object, and then call the Start method on the newly created object.
b. Create the task via the Task.Run method.
c. Create the task via the Task.Factory.StartNew method.
d. All the above.
e. None of the above.

Back 151

d

Front 152

Which of the following is not a locking mechanism?
a. Monitor
b. Semaphore
c. Mutex
d. async

Back 152

d

Front 153

How can you schedule work to be done by a thread from the thread pool?
a. You create a new object of type ThreadPool, and then you call the Start method.
b. You call the ThreadPool.Run method.
c. You call the ThreadPool.QueueUserWorkItem method.
d. You create a new thread and set its property IsThreadPool to true.
e. You call ContinueWith on a running thread from the thread pool.

Back 153

c, d

Front 154

Which of the following are methods of the Parallel class?
a. Run
b. Invoke
c. For
d. ForEach
e. Parallel

Back 154

b, c, d

Front 155

Which method can you use to cancel an ongoing operation that uses CancelationToken?
a. Call Cancel method on the CancelationToken
b. Call Cancel method on the CancelationTokenSource object that was used to create the CancelationToken
c. Call Abort method on the CancelationToken
d. Call Abort method on the CancelationTokenSource object that was used to create the CancelationToken

Back 155

b

Front 156

Which method would you call when you use a barrier to mark that a participant reached that point?
a. Signal
b. Wait
c. SignalAndWait
d. RemoveParticipant
e. JoinParticipant

Back 156

c

Front 157

What code is equivalent with lock(syncObject){…}?
a. Monitor.Lock(syncObject) {…}
b. Monitor.TryEnter(syncObject) {…}
c. Monitor.Enter(syncObject);
try{…}
finally{
Monitor.Exit(syncObject);
}
d. Monitor.Lock(syncObject);
try{…}
catch{
Monitor.Unlock(syncObject);
}

Back 157

c

Front 158

In a multithreaded application how would you increment a variable called counter in a lock free manner? Choose all that apply.
a. lock(counter){
counter++;
}
b. counter++;
c. Interlocked.Add(ref counter, 1);
d. Interlocked.Increment (counter);
e. Interlocked.Increment (ref counter);

Back 158

c, e

Front 159

Which method will you use to signal and EventWaitHandle?
a. Signal
b. Wait
c. Set
d. Reset
e. SignalAndWait

Back 159

c

Front 160

You are given an assignment to create a code generator to automate the task of creating repetitive code. Which namespace contains the types needed to generate code?
a. System.Reflection
b. CodeDom
c. Reflection
d. System.CodeDom

Back 160

d

Front 161

Which code can create a lambda expression?
a. delegate x = x => 5 + 5;
b. delegate MySub(double x);
MySub ms = delegate(double y) {
y * y;
}
c. x => x * x;
d. delegate MySub();
MySub ms = x * x;

Back 161

c

Front 162

You are consulting for a company called Contoso and are taking over an application that was built by a third-party software company. There is an executable that is currently not working because it is missing a DLL that is referenced. How can you figure out which DLLs the application references?
a. Create an instance of the Assembly class, load the assembly, and iterate through the ReferencedAssemblies property.
b. Create an instance of the Assembly class, load the assembly, and call the GetReferencedAssemblies method.
c. Create an instance of the Assembly class, load the assembly, and iterate through the Modules property.
d. Create an instance of the Assembly class, load the assembly, and call the GetModulesReferenced method.

Back 162

b

Front 163

You are a developer for a finance department and are building a method that uses reflection to get a reference to the type of object that was passed as a parameter. Which syntax can be used to determine an object’s type?
a. Type myType = typeof(myParameter);
b. Object myObject =
myParameter.GetType(object);
c. Object myObject = typeof(myParameter);
d. Type myType = myParameter.GetType();

Back 163

d

Front 164

You are asked to create a custom attribute that has a single property, called Version, that allows the caller to determine the version of a method. Which code can create the attribute?
a. class MyCustomAttribute :
System.Reflection.Attribute
{
public string Version { get; set; }
}
b. class MyCustomAttribute : System.Attribute
{
public string Version { get; set; }
}
c. class MyCustomAttribute :
System.AttributeUsage
{
public string Version { get; set; }
}
d. class MyCustomAttribute :
System.ClassAttribute
{
public string Version { get; set; }
}

Back 164

b

Front 165

Which class in the System.Reflection namespace would you use if you want to determine all the classes contained in a DLL file?
a. FileInfo
b. Assembly
c. Type
d. Module

Back 165

b

Front 166

Which method of the Assembly class allows you to get all the public types defined in the Assembly?
a. DefinedTypes
b. Types
c. GetExportedTypes
d. GetModules

Back 166

c

Front 167

Which property of the Assembly class returns the name of the assembly?
a. Name
b. FullyQualifiedName
c. Location
d. FullName

Back 167

d

Front 168

Which method of the Assembly class returns an instance of the current assembly?
a. GetExecutingAssembly
b. GetAssembly
c. GetCurrentAssembly
d. Assembly

Back 168

a

Front 169

Which syntax will Load an Assembly? (Choose all that apply)
a. Assembly.Load("System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089");
b. Assembly.LoadFrom(@"c:\MyProject\
Project1.dll");
c. Assembly.LoadFile(@"c:\MyProject\
Project1.dll");
d. Assembly.ReflectionOnlyLoad(("System.Data,
Version=4.0.0.0, Culture=neutral,
PublicKeyToken=b77a5c561934e089");

Back 169

a, b, c, d

Front 170

Which method should you call if you want the .NET Framework to look in the load-context to load an Assembly?
a. ReflectionOnlyLoad
b. LoadFrom
c. Load
d. LoadFromContext

Back 170

c

Front 171

Which method should you call if you want the .NET Framework to look in the load-from context?
a. ReflectionOnlyLoad
b. LoadFrom
c. Load
d. LoadFromContext

Back 171

b

Front 172

Which line creates an instance of a DataTable using reflection?
a. myAssembly.CreateInstance
(“System.Data.DataTable”);
b. DataTable.GetType();
c. typeof(“System.Data.DataTable”);
d. myType.CreateInstance
(“System.Data.DataTable”);

Back 172

a

Front 173

Which class would you create if you wanted to determine all the properties contained in a class using reflection?
a. Assembly
b. Class
c. Property
d. Type

Back 173

d

Front 174

How can you determine if a class is public or private?
a. Create an instance of the Type class using the typeof keyword and then examine the IsPublic property of the Type variable.
b. Create an instance of the Type class using the typeof keyword and then examine the IsPrivate property of the Type variable.
c. Create an instance of the class within a try catch block and catch the exception if you cannot create an instance of the class.
d. Create an instance of the class and check the IsPublic property.

Back 174

a

Front 175

Which class in the System.Reflection namespace is used to represent a field defined in a class?
a. PropertyInfo
b. FieldInfo
c. Type
d. EventInfo

Back 175

b

Front 176

Which property of the Type class can you use to determine the number of dimension for an array?
a. GetDimension
b. GetRank
c. GetDimensions
d. GetArrayRank

Back 176

d

Front 177

Which statement will returns a private, instance field called "myPrivateField" using reflection? Assume the myClass variable is an instance of a class.
a. myClass.GetType().GetField
(“myPrivateField”, BindingFlags.NonPublic |
BindingFlags.Instance)
b. myClass.myPrivateField
c. myClass.GetType().GetField
(“myPrivateField”)
d. myClass. GetType().GetField(“myPrivateField”,
BindingFlags.NonPublic &
BindingFlags.Instance)

Back 177

a

Front 178

Which method of the MethodInfo class can be used to execute the method?
a. Execute
b. Invoke
c. Call
d. Load

Back 178

b

Front 179

Which statement uses reflection to execute the method and passes in two parameters given the following code block?
MyClass myClass = new MyClass();
MethodInfo myMethod = typeof(MyClass).GetMethod(“Multiply”);
a. myMethod.Execute(myClass, new object[] { 4,
5 });
b. myMethod.Execute(MyClass, new object[] { 4,
5 });
c. myMethod.Invoke(myClass, new object[] { 4,
5 });
d. myMethod.Invoke(MyClass, new object[] { 4,
5 });

Back 179

c

Front 180

Which class name follows the standard naming convention for a custom attribute class?
a. AttributeMyCustom
b. MyCustomAttribute
c. MyCustom
d. MyCustom_Attribute

Back 180

b

Front 181

How can you limit the scope of a custom attribute that you are creating so that it can be used only by a class?
a. Set the custom attribute’s TargetLevel property to Class.
b. Add the following attribute above the custom attribute’s class declaration:
[System.AttributeUsage(AttributeTargets.Class)]
c. Set the custom attribute’s TargetLevel attribute to Class.
d. Set the custom attribute’s Scope property to Class.

Back 181

b

Front 182

If you have created a custom attribute class called DataMappingAttribute and have used it in a class called Person, which statement will return all the DataMappingAttributes that have been applied to the Person class?
a. typeof(DataMappingAttribute).
GetCusomAttributes(typeof(Person),
false);
b. typeof(Person).GetAttributes(typeof
(DataMappingAttribute), false);
c. typeof(DataMappingAttribute).
GetAttributes(typeof(Person), false);
d. typeof(Person).GetCusomAttributes
(typeof(DataMappingAttribute), false);

Back 182

d

Front 183

Which class in the CodeDOM is the top-level class that is the container for all other objects within the class?
a. CodeNamespace
b. CodeCompileUnit
c. CodeConstructor
d. CodeDOMProvider

Back 183

b

Front 184

Which statement generates a namespace statement using the CodeDOM?
a. Namespace namespace = new
Namespace("MyNamespace");
b. string namespace =
Namespace.Create("MyNamespace");
c. CodeNamespace codeNamespace =
new CodeNamespace("MyNamespace");
d. string namespace =
CodeNamespace.Create("MyNamespace");

Back 184

c

Front 185

Which class in the CodeDOM is used to create a statement that declares a class?
a. CodeClassDeclaration
b. CodeCompileUnit
c. CodeTypeDeclaration
d. CodeClass

Back 185

c

Front 186

Which statement should be added to the following block of code to set a field’s type to a double using the CodeDOM?
CodeMemberField xField = new CodeMemberField();
xField.Name = "x";
a. xField.Type = new CodeTypeReference(typeof(double));
b. xField.Type = double;
c. xField.Type = typeof(double));
d. xField.Type = new double();

Back 186

a

Front 187

Which property of the CodeMemberProperty class should be set to true to tell the compiler to generate a set accessor using the CodeDOM?
a. Set
b. HasSet
c. CreateSet
d. GenerateSet

Back 187

b

Front 188

Which class in the CodeDOM is used to represent either the this keyword in C# or the Me keyword in VB.NET?
a. CodeMeReference
b. CodeThisReference
c. CodeMeReferenceExpression
d. CodeThisReferenceExpression

Back 188

d

Front 189

Which property of the CodeConditionStatement is used to add statements to the true path of logic using the CodeDOM?
a. TrueConditions
b. TrueStatements
c. TrueCodeStatements
d. TrueExpressions

Back 189

b

Front 190

Which class in the CodeDOM is used to call a method?
a. CodeMethodInvoke
b. CodeMethodInvokeExpression
c. CodeMethodCall
d. CodeMethodCallExpression

Back 190

b

Front 191

Which class in the CodeDOM is used to generate a class file?
a. CodeDOMProvider
b. CodeDOMTextWriter
c. CodeDOMClassWriter
d. CodeDOMGenerator

Back 191

a

Front 192

You are looking at the output of a file generated using the CodeDOM. The file is in C# and you notice that the brackets for all your methods are not on separate lines. Which property of the CodeGeneratorOptions class can you use to force the brackets to be on separate lines, and what should the property be set to?
a. BracketStyle = BracketStyle.Separate
b. BracingStyle = BracingStyle.Separate
c. BracingStyle = "C"
d. BracketStyle = "C"

Back 192

c

Front 193

Which statement is a valid expression lambda?
a. x => x * y
b. x => x * x
c. x => { int y; y = x * x; }
d. x => y

Back 193

b (Answer b is an expression lamba; answer c is a statement lambda)

Front 194

Which statement should be on the left side of a goes to operator if you want to pass two parameters to a lambda expression?
a. { x, y }
b. ( x, y )
c. { x => y }
d. ( x => y )

Back 194

b

Front 195

What is the correct delegate declaration for the following method?
void int Multiply(int x, int y)
a. int MyDelegate(int a, int b) as delegate;
b. delegate int MyDelegate(int a, int b);
c. int Multiply(int x, int y);
d. delegate void MyDelegate(void a, void b);

Back 195

b

Front 196

True or false? You can reference local variables that are not passed as parameters in an anonymous method.
a. True
b. False

Back 196

a

Front 197

Which method of the CodeDOMProvider generates a code file?
a. GenerateCode
b. GenerateCodeFileFromCompileUnit
c. GenerateFileFromCompileUnit
d. GenerateCodeFromCompileUnit

Back 197

c

Front 198

Which class in the CodeDOM is used to create a method declaration statement?
a. MethodDeclaration
b. CodeMethodDeclaration
c. CodeMemberMethod
d. CodeMemberDeclaration

Back 198

c

Front 199

Which is the => syntax referred to as in a lambda expression?
a. The parameter operator
b. The goes to operator
c. The lambda operator
d. The expression operator

Back 199

b

Front 200

Which object does the variable mySet inherit from?
Int[] mySet = new int[5];
a. System.Collection
b. System.Collection.List
c. System.Array
d. None, this is a value type.

Back 200

c

Front 201

Which type should you use to store objects of different types but do not know how many elements you need at the time of creation?
a. Collection
b. List
c. Stack
d. ArrayList

Back 201

d

Front 202

If you create a custom class that is going to be used as elements in a List object and you want to use the Sort method of the List object to sort the elements in the array, what steps must you take when coding the custom class?
a. Inherit from the ICompare interface.
Implement the Comparable method.
b. Inherit from the IComparable interface.
Implement the CompareTo method.
c. Inherit from the System.Array class.
Override the Sort method.
d. Inherit from the List class.
Implement the Sort method.

Back 202

b

Front 203

Which collection would you use if you need to process the items in the collection on first-in-first-out order?
a. HashTable
b. Queue
c. Stack
d. List

Back 203

b

Front 204

Which collection would you use if you need to process the items in the collection on a last-in-first-out order?
a. HashTable
b. Queue
c. Stack
d. List

Back 204

c

Front 205

Which collection would you use if you need to quickly find an element by its key rather than its index?
a. Dictionary
b. List
c. SortedList
d. Queue

Back 205

a, c

Front 206

Which ADO.NET object is used to connect to a database?
a. Database
b. Connection
c. Command
d. DataAdapter

Back 206

b

Front 207

Which properties of an ADO.NET Command object must you set to execute a stored procedure?
a. CommandType
StoredProcedureName
Parameters
b. IsStoredProcedure
CommandType
StoredProcedureName
Parameters
c. CommandType
CommandText
Parameters
d. IsStoredProcedure
CommandText
Parameters

Back 207

c

Front 208

Which Command object’s method would you use to execute a query that does not return any results?
a. ExecuteNonQuery
b. ExecuteDataReader
c. ExecuteScalar
d. Execute

Back 208

a

Front 209

Which Command object’s method would you use to execute a query that returns only one row and one column?
a. ExecuteNonQuery
b. ExecuteDataReader
c. ExecuteScalar
d. Execute

Back 209

c

Front 210

Which ADO.NET object is a forward only cursor and is connected to the database while the cursor is open?
a. DBDataReader
b. DataSet
c. DataTable
d. DataAdapter

Back 210

a

Front 211

Which ADO.NET Command object’s property would you use when a query returns the SUM of a column in a table?
a. ExecuteNonQuery
b. ExecuteDataReader
c. ExecuteScalar
d. Execute

Back 211

c

Front 212

Which ADO.NET object is a fully traversable cursor and is disconnected from the database?
a. DBDataReader
b. DataSet
c. DataTable
d. DataAdapter

Back 212

c

Front 213

Which method of a DataAdapter is used to populate a DataSet?
a. Populate
b. Fill
c. Load
d. DataSets[0].Fill

Back 213

b

Front 214

Which property of an ADO.NET DataAdapter is used to insert records in a database?
a. InsertText
b. InsertType
c. InsertCommand
d. InsertDataTable

Back 214

c

Front 215

Which ADO.NET Command object’s property would you use when a query returns the SUM of a column in a table?
a. ExecuteNonQuery
b. ExecuteDataReader
c. ExecuteScalar
d. Execute

Back 215

c

Front 216

When using the ADO.NET Entity Framework you create a Model that represents the object in the database. What class does the Model inherit from?
a. DBContext
b. DBSet
c. Model
d. Connection

Back 216

a

Front 217

How are stored procedures represented in the ADO.NET Entity Framework?
a. A class is created with the same name as the stored procedure, and the Execute method is implemented.
b. A method is added to the Model that is the same name as the stored procedure.
c. Stored procedures cannot be called from the ADO.NET Entity Framework.
d. A method is created in the entity class for the table in the stored procedure.

Back 217

b

Front 218

Which code uses the ADO.NET Entity Framework to add a record to the database?
a.
using (NorthwindsEntities db = new NorthwindsEntities())
{
Category category = new Category()
{
CategoryName = "Alcohol",
Description = "Happy Beverages"
};

db.Categories.Add(category);
db.SaveChanges();
}
b.
using (NorthwindsEntities db = new NorthwindsEntities())
{
Category category = new Category()
{
CategoryName = "Alcohol",
Description = "Happy Beverages"
};

db.Categories.Add(category);
db.InsertRecords ();
}
c.
using (NorthwindsEntities db = new NorthwindsEntities())
{
Category category = new Category()
{
CategoryName = "Alcohol",
Description = "Happy Beverages"
};

db.Categories.Insert (category);
db.SaveChanges();
}
d.
using (NorthwindsEntities db = new NorthwindsEntities())
{
Category category = new Category()
{
CategoryName = "Alcohol",
Description = "Happy Beverages"
};

db.Categories.Insert(category);
db.InsertRecords();
}

Back 218

a

Front 219

Which code uses the ADO.NET Entity Framework to update a record in the database?
a.
Category category = db.Categories.First(c => c.CategoryName == "Alcohol");
category.Description = "Happy People";
db.UpdateRecords ();
b.
Category category = db.Categories.First(c => c.CategoryName == "Alcohol");
category.Description = "Happy People";
db.Categories.UpdateRecords();

c.
Category category = db.Categories.First(c => c.CategoryName == "Alcohol");
category.Description = "Happy People";
db.SaveChanges();

d.
Category category = db.Categories.First(c => c.CategoryName == "Alcohol");
category.Description = "Happy People";
db.Categories.SaveChanges();

Back 219

c

Front 220

Which code uses the ADO.NET Entity Framework to delete a record?
a.
using (NorthwindsEntities db = new NorthwindsEntities())
{
Category category = db.Categories.First(c => c.CategoryName ==
"Alcohol");
db.Categories.Delete(category);
}
b.
using (NorthwindsEntities db = new NorthwindsEntities())
{
Category category = db.Categories.First(c => c.CategoryName ==
"Alcohol");
db.Categories.Remove(category);
db.SaveChanges();
}
c.
using (NorthwindsEntities db = new NorthwindsEntities())
{
Category category = db.Categories.First(c => c.CategoryName ==
"Alcohol");
db.Categories.Remove(category);
db.DeleteRecords();
}
d.
using (NorthwindsEntities db = new NorthwindsEntities())
{
Category category = db.Categories.First(c => c.CategoryName ==
"Alcohol");
db.Delete(category);
}

Back 220

b

Front 221

When you create a WCF Data Service, what two steps must you take to expose an Entity?
a. Set the type in the DataService< T > class declaration.
b. Add the following line to the InitializeService method:
config.SetEntitySetAccessRule("Categories", EntitySetRights.AllRead );
c. Add the following line to the InitializeService method:
config.SetEntitySetsAccessRule("Categories", EntitySetRights.AllRead );
d. Add the following line to the InitializeService method:
config.SetServiceOperationAccessRule("Categories", EntitySetRights.AllRead );

Back 221

a, b

Front 222

What is the default form of the data returned from a WCF Data Service?
a. JSON
b. HTML
c. ATOM XML
d. XSLT

Back 222

c

Front 223

What querystring parameter can you use to select only records from the Categories table where the CategoryName is equal to Beverages?
a. $filter=CategoryName='Beverages'
b. $select=CategoryName='Beverages'
c. $where=CategoryName='Beverages'
d. $filter=CategoryName eq 'Beverages'

Back 223

d

Front 224

What querystring can you use to select the Category record with a primary key of 1?
a. /Categories/$select=CategoryId=1
b. /Categories(1)
c. /Categories/$where=CategoryId=1
d. /Categories/$filter=CategoryId eq 1

Back 224

b, d

Front 225

What querystring parameter can you use to select the CategoryName for the record with a primary key of 1?
a. /Categories(1)/$select=CategoryName
b. /Categories/$where=CategoryId=
1&$select=CategoryName
c. /Categories(1)/CategoryName
d. /Categories/CategoryId=
1&CategoryName=$select

Back 225

a, c

Front 226

Which code creates an instance of the NorthwindsEntities data model that is exposed as a WCF Data Service?
a.
NorthwindsEntities db = new NorthwindsEntities(("http://localhost:8999/NorthwindsService.svc/"));
b.
NorthwindsEntities db = new NorthwindsEntities(new
Uri("http://localhost:8999/NorthwindsService.svc/"));
c.
NorthwindsEntities db = new NorthwindsEntities();
d.
NorthwindsEntities db = new NorthwindsEntities(new
Service("http://localhost:8999/NorthwindsService.svc/"));

Back 226

b

Front 227

Which code adds a record using WCF Data Services?
a.
Category category = new Category()
{
CategoryName = "Alcohol",
Description = "Happy Beverages"
};

db.Categories.Add(category);
DataServiceResponse response = db.SaveChanges();
b.
Category category = new Category()
{
CategoryName = "Alcohol",
Description = "Happy Beverages"
};

db.AddToCategories(category);
DataServiceResponse response = db.SaveChanges();
c.
Category category = new Category()
{
CategoryName = "Alcohol",
Description = "Happy Beverages"
};

db.Categories.Add(category);
DataServiceResponse response = db.Update();
d.
Category category = new Category()
{
CategoryName = "Alcohol",
Description = "Happy Beverages"
};

db.AddToCategories(category);
DataServiceResponse response = db.Update();

Back 227

b

Front 228

Which code is used to update a record using a WCF Data Service?
a.
Category category = db.Categories.Where(c => c.CategoryName ==
"Alcohol").FirstOrDefault();

category.Description = "Happy People";

db.UpdateObject(category);
b.
Category category = db.Categories.Where(c => c.CategoryName ==
"Alcohol").FirstOrDefault();

category.Description = "Happy People";

db.SaveChanges();
c.
Category category = db.Categories.Where(c => c.CategoryName ==
"Alcohol").FirstOrDefault();

category.Description = "Happy People";

db.UpdateObject(category);
db.SaveChanges();
d.
Category category = db.Categories.Where(c => c.CategoryName ==
"Alcohol").FirstOrDefault();

category.Description = "Happy People";

db.UpdateObject(category);
db.Update();

Back 228

c

Front 229

Which code can delete a record using a WCF Data Service?
a.
Category category = db.Categories.Where(c => c.CategoryName ==
"Alcohol").FirstOrDefault();
db.DeleteObject(category);
b.
Category category = db.Categories.Where(c => c.CategoryName ==
"Alcohol").FirstOrDefault();
db.Delete(category);
c.
Category category = db.Categories.Where(c => c.CategoryName ==
"Alcohol").FirstOrDefault();
db.DeleteObject(category);
db.Update ();
d.
Category category = db.Categories.Where(c => c.CategoryName ==
"Alcohol").FirstOrDefault();
db.DeleteObject(category);
db.SaveChanges();

Back 229

d

Front 230

Which object is a static class that enables you to perform operations on a file?
a. FileInfo
b. File
c. FileObject
d. FileHelper

Back 230

b

Front 231

What method on the DirectoryInfo object can return all subdirectories within the directory?
a. GetFolders
b. GetSubFolders
c. GetDirectories
d. GetSubDirectories

Back 231

c

Front 232

Which class is used to read and write data to and from a file?
a. FileStream
b. BufferedStream
c. MemoryStream
d. PipeStream

Back 232

a

Front 233

Which FileMode enumeration would you use if you want to create a new file or overwrite an existing file?
a. FileMode.CreateNew
b. FileMode.Create
c. FileMode.Open
d. FileMode.CreateOrOpen

Back 233

b

Front 234

Which FileMode enumeration would you use if you want to create a new file to open the file if it exists?
a. FileMode.Append
b. FileMode.CreateNew
c. FileMode.CreateOrOpen
d. FileMode.OpenOrCreate

Back 234

a, d

Front 235

Which FileMode enumeration would you use if you want to create a new file or throw an exception if the file already exists?
a. FileMode.CreateNew
b. FileMode.Create
c. FileMode.Open
d. FileMode.OpenOrCreate

Back 235

a

Front 236

Which FileAccess enumeration would you use if you want to read and write to a file?
a. FileAccess.Read
b. FileAccess.Write
c. FileAccess.WriteRead
d. FileAccess.ReadWrite

Back 236

d

Front 237

Which FileShare enumeration would you use if you do not want to allow any other process to access the file while you have it open?
a. FileShare.Read
b. FileShare.ReadWrite
c. FileShare.NoAccess
d. FileShare.None

Back 237

d

Front 238

Which method of the StreamReader object reads the next character in the file?
a. Read
b. ReadBlock
c. ReadLine
d. ReadChar

Back 238

a

Front 239

Which keyword is used to modify a method that contains a call to an asynchronous method?
a. await
b. async
c. wait
d. thread

Back 239

b

Front 240

Which keyword is used to call a method and suspend execution until that method returns?
a. await
b. async
c. wait
d. thread

Back 240

a

Front 241

Which object serialized an object to binary format?
a. BinarySerializer
b. BinaryFormatter
c. BinaryStream
d. BinaryWriter

Back 241

b

Front 242

Which attribute must be set for a class for it to be serialized?
a. [Serialize]
b. [Serialized]
c. [Serializable]
d. [SerializeFormat=Binary]

Back 242

c

Front 243

Which code can serialize the Person object in binary format?
a.
ISerializable serializer = new BinarySerializer();
Stream stream = new FileStream("Person.bin", FileMode.Create,
FileAccess.Write, FileShare.None);
serializer.Serialize(stream, person);
stream.Close();
b.
Stream stream = new FileStream("Person.bin", FileMode.Create,
FileAccess.Write, FileShare.None);
Person.Serialize(stream, person);
stream.Close();
c.
IFormatter formatter = new BinaryFormatter();
Stream stream = new FileStream("Person.bin", FileMode.Create,
FileAccess.Write, FileShare.None);
formatter.Serialize(stream, person);
stream.Close();
d.
Stream stream = new BinaryStream("Person.bin", FileMode.Create,
FileAccess.Write, FileShare.None);
stream.Serialize(person);
stream.Close();

Back 243

c

Front 244

Which class can you use to serialize an object to XML?
a. BinarySerializer
b. XMLSerializer
c. XMLFormatter
d. XMLWriter

Back 244

b

Front 245

Which attribute can you use to prevent a property from being serialized to XML?
a. [XmlPrevent]
b. [XmlHide]
c. [XmlHide=true]
d. [XmlIgnore]

Back 245

d

Front 246

Which attribute must you place before the declaration of a class to allow it be serialized as JSON?
a. [Serializable]
b. [JsonSerializable]
c. [DataContract]
d. [Serialize=JSON]

Back 246

c

Front 247

Which attribute must be placed before a property for it to be serialized as JSON?
a. [Serialize]
b. [DataMember]
c. [SerializeProperty]
d. [DataProperty]

Back 247

b

Front 248

Which object is used to serialize an object to JSON?
a. JsonSerializer
b. JsonFormatter
c. DataContractJsonSerializer
d. DataContractJsonFormatter

Back 248

c

Front 249

Which attribute must you use if you want to perform custom serialization?
a. OnDeserializedAttribute
b. OnDeserializingAttribute
c. OnSerializedAttribute
d. OnSerializingAttribute

Back 249

a, b, c, d

Front 250

Which interface can you implement if you want to implement custom serialization?
a. ISerializable
b. ISerial
c. ICustomSerializable
d. ICustomSerial

Back 250

a

Front 251

Which two steps must you take to implement custom serialization when implementing the ISerializable interface?
a. Create a constructor that takes the SerializationInfo and StreamingContext objects as parameters.
b. Override the Serialize method.
c. Override the DeSerialize method.
d. Override the GetObjectData method.

Back 251

a, d

Front 252

Which answer has the correct order of keywords for a LINQ query expression?
a. select, from, where
b. where, from, select
c. from, where, select
d. from, select, where

Back 252

c

Front 253

Which where clause can select all integers in the myList object that are even numbers given the following from clause?
from i in myList
a. where myList.Contains(i % 2)
b. where i % 2 = 0
c. where i % 2 == 0
d. where i % 2 equals 0

Back 253

c

Front 254

Which line of code executes the LINQ query?
1. var result = from i in myArray
2. order by i
3. select i
4. foreach(int i in result)
5. { …}
a. Line 1
b. Line 2
c. Line 3
d. Line 4

Back 254

d

Front 255

Which method can you use to find the minimum value in a sequence?
a. (from i in myArray select i).Min()
b. from i in myArray select Min(i)
c. from Min(i) in myArray select i
d. from i in Min(myArray) select I

Back 255

a

Front 256

Which methods can you use to find the first item in a sequence?
a. Min
b. First
c. Skip
d. Take

Back 256

b, d

Front 257

Which where clause returns all integers between 10 and 20?
a. where i >= 10 and i <= 20
b. where i >= 10 && i <= 20
c. where i gt 10 and i lt 20
d. where i gt 10 && i lt 20

Back 257

b

Front 258

Which clause orders the state and then the city?
a. orderby h.State
orderby h.City
b. orderby h.State thenby h.City
c. orderby h.State, h.City
d. orderby h.State, thenby h.City

Back 258

c

Front 259

Which statement selects an anonymous type?
a. select { h.City, h.State }
b. select h
c. select new { h.City, h.State }
d. select h.City, h.State

Back 259

c

Front 260

Which on statement joins two sequences on the StateId property?
a. on e.StateId equals s.StateId
b. on e.StateId = s.StateId
c. on e.StateId == s.StateId
d. on e.StateId.Equals(s.StateId)

Back 260

a

Front 261

Which two keywords must you use in a join clause to create an outer join?
a. groupby, into
b. into, DefaultIfEmpty
c. new, DefaultIfEmpty
d. into, groupby

Back 261

b

Front 262

Which join clause uses a composite key?
a. on new { City = e.City, State = e.State }
equals new { City = h.City, State =
h.State }
b. on e.City = h.City && e.State = h.State
c. on e.City = h.City and e.State = h.State
d. on e.City equals h.City and e.State
equals h.State

Back 262

a

Front 263

Which statement groups a sequence by the State property?
a. groupby e.State
b. group e.State
c. group e by e.State
d. groupby e.State in states

Back 263

c

Front 264

Which answers return the count of all even numbers?
a. myArray.Where(i => i % 2 == 0).Count()
b. myArray.Count(i => i % 2 == 0)
c. myArray.Count(i =>).Where(i % 2 == 0)
d. myArray.Count(Where(i => i % 2))

Back 264

a, b

Front 265

Which types can be queried using LINQ?
a. IEnumerable
b. int
c. IQueryable
d. List

Back 265

a, c, d

Front 266

Which keyword is used to create an implicitly typed variable?
a. type
b. object
c. var
d. implicit

Back 266

c

Front 267

Which syntax is a valid from clause in a LINQ query expression?
a. from myArray
b. select * from myArray
c. from a in myArray
d. from * in myArray

Back 267

c

Front 268

Which statement is a proper where clause in a LINQ query expression?
a. where i = 5 or i = 6
b. where i == 5 || i == 6
c. where i = 5 || I = 6
d. where i == 5 or i == 6

Back 268

b

Front 269

Which answer contains the predicate clause?
a. var evenNumbers = from i in myArray
b. where i % 2 == 0
c. select i
d. orderby I

Back 269

b

Front 270

True or false? The where clause can appear anywhere in a LINQ query expression except the first and last clause?
a. True
b. False

Back 270

a

Front 271

Which clause in a LINQ query expression can sort the results?
a. sortby
b. orderby
c. order by
d. sort by

Back 271

b

Front 272

What is selecting a limited number of properties or transforming the result into a different type referred to as?
a. Implicitly typed variables
b. Reflection
c. Predicate
d. Projection

Back 272

d

Front 273

What is an object that contains read-only properties that is not explicitly declared referred to as?
a. Implicitly typed variable
b. Anonymous type
c. LINQ query expression
d. Dynamic variable

Back 273

b

Front 274

Which type does a groupby clause return from a LINQ query expression?
a. IGrouping
b. IGrouping
c. IGroupedBy
d. IGroupedBy

Back 274

a

Front 275

Which method-based query is used to filter a sequence?
a. Filter
b. Search
c. GoesTo
d. Where

Back 275

d

Front 276

Which method-based query can be used to sort elements in a sequence descending?
a. SortByDescending
b. OrderByDescending
c. SortDescending
d. OrderDescending

Back 276

b

Front 277

Which method-based query can be used to project the results of a sequence?
a. Select
b. Where
c. Count
d. First

Back 277

a

Front 278

Which method-based query would you use to perform an outer join on two sequences?
a. Join
b. OuterJoin
c. GroupJoin
d. SelectMany

Back 278

c

Front 279

15. Which method-based query can be used to group elements of a sequence?
a. Group
b. GroupBy
c. GroupCount
d. GroupOver

Back 279

b

Front 280

Which method-based query can concatenate two sequences similar to how a UNION clause works in a SQL statement?
a. GroupJoin
b. Union
c. Join
d. Concat

Back 280

d

Front 281

Which method-based query can be used return all elements in a sequence after a specified index?
a. Skip
b. Take
c. Select
d. Where

Back 281

a

Front 282

Which method-based query limits the number of elements returned from a sequence?
a. Skip
b. Take
c. Select
d. GroupBy

Back 282

b

Front 283

Which class can be used to transform a sequence to XML?
a. XML
b. XElement
c. Element
d. XDocument

Back 283

b

Front 284

Which method-based query can be used to select a unique list of elements in a sequence?
a. Unique
b. Select
c. Distinct
d. Where

Back 284

c

Front 285

If the user is typing data into a TextBox and types an invalid character, which of the following actions would be inappropriate for the program to take?
a. Change the TextBox’s background color to indicate the error.
b. Silently discard the character.
c. Display an asterisk next to the TextBox to indicate the error.
d. Display a message box telling the user that there is an error.

Back 285

d

Front 286

If the user types an invalid value into a TextBox and moves focus to another TextBox, which of the following actions would be inappropriate for the program to take?
a. Force focus back into the TextBox that contains the error.
b. Change the first TextBox’s background color to indicate the error.
c. Change the first TextBox’s font to indicate the error.
d. Display an asterisk next to the first TextBox to indicate the error.

Back 286

a

guys, we are not real sure about this answer. What do you think?

Front 287

If the user enters some invalid data on a form and then clicks the form’s Accept button, which of the following actions would be appropriate for the program take?
a. Change the background color of TextBoxes containing invalid values to indicate the errors.
b. Display a message box telling the user that there is an error.
c. Do not close the form until the user corrects all the errors.
d. All the above.

Back 287

d

Front 288

Which of the following methods returns true if a regular expression matches a string?
a. Regex.Matches
b. Regex.IsMatch
c. Regexp.Matches
d. String.Matches

Back 288

b

Front 289

Which of the following regular expressions matches the Social Security number format ###-##-#### where # is any digit?
a. ^###-##-####$
b. ^\d3-\d2-\d4$
c. ^\d{3}-\d{2}-\d{4}$
d. ^[0-9]3-[0-9]2-[0-9]4$

Back 289

c

Front 290

Which of the following regular expressions matches a username that must include between 6 and 16 letters, numbers, and underscores?
a. ^[a-zA-Z0-9_]?{6}$
b. ^[a-zA-Z0-9_]{6,16}$
c. ^[A-Z0-9a-z_]?$
d. ^\w{16}?$

Back 290

b

Front 291

Which of the following regular expressions matches license plate values that must include three uppercase letters followed by a space and three digits, or three digits followed by a space and three uppercase letters?
a. (^\d{3} [A-Z]{3}$)|(^[A-Z]{3}
\d{3}$)
b. ^\d{3} [A-Z]{3} [A-Z]{3} \d{3}$
c. ^\w{3} \d{3}|\d{3} \w{3}$
d. ^(\d{3} [A-Z]{3})?$

Back 291

a

Front 292

Which of the following statements about assertions is true?
a. The Debug.Assert method is ignored in release builds.
b. The program must continue running even if a Debug.Assert method stops the program.
c. When an assertion fails in debug builds, the Debug.Assert method lets you halt, debug the program, or continue running.
d. All the above.

Back 292

d

Front 293

Which of the following statements about the Debug and Trace classes is true?
a. The Debug class generates messages if DEBUG is defined. The Trace class generates messages if both DEBUG and TRACE are defined.
b. The Debug class generates messages if DEBUG is defined. The Trace class generates messages if TRACE is defined.
c. The Debug and Trace classes both generate messages if DEBUG is defined.
d. The Debug and Trace classes both generate messages if TRACE is defined.

Back 293

b

Front 294

Which of the following statements about builds is true by default?
a. Debug builds define the DEBUG symbol.
b. Debug builds define the TRACE symbol.
c. Release builds define the DEBUG symbol.
d. Release builds define the TRACE symbol.
e. Release builds define the RELEASE symbol.

Back 294

a, b, d

Front 295

Which of the following statements about PDB files is false?
a. You need a PDB file to debug a compiled executable.
b. You can use a PDB file to debug any version of a compiled executable.
c. The “full” PDB file contains more information than a “pdb-only” PDB file.
d. If you set the PDB file type to None, Visual Studio doesn’t create a PDB file.

Back 295

b

Front 296

Which of the following statements about tracing and logging is false?
a. Tracing is the process of instrumenting a program to track what it is doing.
b. Logging is the process of making the program record key events in a log file.
c. You can use DEBUG and TRACE statements to trace or log a program’s execution.
d. A program cannot write events into the system’s event logs, so you can see them in the Event Viewer.

Back 296

d

Front 297

Which of the following methods would probably be the easiest way to find bottlenecks in a program if you had no idea where to look?
a. Use an automatic profiler.
b. Instrument the code by hand.
c. Use performance counters.
d. Set breakpoints throughout the code and step through execution.

Back 297

a

Front 298

What of the following is the best use of performance counters?
a. To determine which of a program’s methods use the most CPU time.
b. To determine how often a particular operation is occurring on the system as a whole.
c. To determine how often a particular operation is occurring in a particular executing instance of a program.
d. To find the deepest path of execution in a program’s call tree.

Back 298

b

Front 299

Which of the following events occurs if a program sets the Validating event’s e.Cancel value to true?
a. The user cannot move focus out of the control that raised the event.
b. The control that raised the event displays an error indicator.
c. The computer beeps.
d. The form refuses to close.

Back 299

a, d

Front 300

Which of the following can a program use to verify that the user has entered a value in the FirstNameTextBox.
a. if (FirstNameTextBox.IsEmpty)
b. if (FirstNameTextBox.IsBlank)
c. if (FirstNameTextBox.Text.Length == 0)
d. if (FirstNameTextBox.Text.IsBlank)
e. if (FirstNameTextBox.Text == "")

Back 300

c, e

Front 301

3. Which of the following methods should you use to verify that a TextBox should contain an integer value?
a. IsInt
b. string.IsInteger
c. int.Parse
d. int.TryParse

Back 301

d

Front 302

How could you determine that values such as “-.” are valid initial pieces of a valid floating point value?
a. Use float.Parse.
b. Use float.TryParse.
c. Add 0 before the value and use float.TryParse to see if the result is valid.
d. Add 0 after the value and use float.TryParse to see if the result is valid.

Back 302

d

Front 303

Which of the following string methods returns the index of the first occurrence of a string within another string?
a. Position
b. PositionOf
c. IndexOf
d. Pos

Back 303

c

Front 304

Which of the following string methods can you use to remove a particular character from a string?
a. Remove
b. Replace
c. ReplaceString
d. Substring

Back 304

b

Front 305

Which of the following string methods can you use to remove characters in a particular location in a string?
a. Remove
b. Replace
c. ReplaceString
d. Substring

Back 305

a

Front 306

Which of the following string methods can you use to get characters from a particular position in a string?
a. Remove
b. Replace
c. ReplaceString
d. Substring

Back 306

d

Front 307

Which of the following regular expression methods returns true if a string matches a particular pattern?
a. Matches
b. Match
c. IsMatch
d. HasMatch

Back 307

c

Front 308

Which of the following regular expressions matches any number of vowels?
a. [aeiouAEIOU]
b. [aeiouAEIOU]*
c. [aeiouAEIOU]+
d. /v*

Back 308

b

Front 309

Which of the following regular expressions matches between 1 and 3 uppercase letters?
a. [A-Z:1-3]
b. [A-Z]{1,3}
c. [AZ]+++
d. [A-Z]{1-3}

Back 309

b

Front 310

Which of the following regular expressions matches either of the strings true or false?
a. (true|false)
b. (true)(false)
c. (true,false)
d. (true)or(false)

Back 310

a

Front 311

Which of the following matches a 7-digit U.S. phone number?
a. [0-9]{3}-[0-9]{4}
b. ^[0-9]{3}-[0-9]{4}$
c. \d{3}-\d{4}
d. ^\d{3}-\d{4}$

Back 311

b, d

Front 312

Which of the following form events lets a program validate the entries on the form and refuse to close if they are incorrect?
a. Closing
b. FormClosing
c. FormClosed
d. FormValidating

Back 312

b

Front 313

Which of the following statements about the Debug and Trace classes are true?
a. Debug methods are ignored if the DEBUG preprocessor symbol is not defined.
b. Trace methods are ignored if the DEBUG preprocessor symbol is not defined.
c. Trace methods are ignored if the TRACE preprocessor symbol is not defined.
d. Trace methods are ignored if Debug methods are ignored.

Back 313

a, c

Front 314

Which of the following statements about Debug and Trace listeners is true?
a. The default listener sends output to the Console window.
b. You can remove the default listener.
c. You can make a listener to save Debug or Trace output in a file.
d. You can make a listener to save Debug or Trace output in an event log.
e. You can make as many listeners as you like.

Back 314

a, b, c, d, e

Front 315

Which of the following statements about system event logs is true?
a. You can use the Event Viewer to view event logs.
b. A program can write entries only in an event log that it created.
c. Event logs keep track of the number of times something happened or the average number of events per hour.
d. You use the EventLog class’s WriteEvent method to save a message into an event log.

Back 315

a, d

Front 316

When Visual Studio’s profiler uses the CPU sampling method, how does it measure an application’s performance?
a. It periodically interrupts the program, determines its location, and stores the location to see where the program spends the most time.
b. It adds statements to the code to store the program’s location to see where the program spends the most time.
c. It records the program’s location at statements that you add to the code to see where the program spends the most time.
d. After each CPU cycle it records the program’s location to see where the program spends the most time.

Back 316

a

Front 317

When Visual Studio’s profiler uses the instrumentation method, how does it measure an application’s performance?
a. It periodically interrupts the program, determines its location, and stores the location to see where the program spends the most time.
b. It adds statements to the code to store the program’s location to see where the program spends the most time.
c. It records the program’s location at statements that you add to the code to see where the program spends the most time.
d. After each CPU cycle it records the program’s location to see where the program spends the most time.

Back 317

b

Front 318

For which of the following would performance counters be helpful?
a. Identify the methods where the program spends the most time.
b. Track the average number of jobs processed per second over time.
c. Identify jobs that take longer than average to process.
d. Record the total number of jobs processed.

Back 318

b, d

Front 319

You are a developer at company xyx. You have been asked to implement a method to safely save and restore data on the local machine. What kind of algorithm best fits the requirements?
a. Symmetric algorithm
b. Asymmetric algorithm
c. Hashing algorithm
d. X509Certificate
e. None of the above

Back 319

a

Front 320

You are a developer at the company xyx. You have been asked to implement a method to safely send data to another machine. What kind of algorithm best fits the requirements?
a. Symmetric algorithm
b. Asymmetric algorithm
c. Hashing algorithm
d. X509Certificate
e. None of the above

Back 320

b

Front 321

You are a developer at the company xyx. You have been asked to implement a method to handle password encryption without offering the possibility to restore the password. What kind of algorithm best fits the requirements?
a. Symmetric algorithm
b. Asymmetric algorithm
c. Hashing algorithm
d. X509Certificate
e. None of the above

Back 321

c

Front 322

Which of the following code snippets will you use to calculate the secure hash of a byte array called userData? If you already have created an algorithm object called sha.
a. userData.GetHashCode(sha);
b. sha.ComputeHash(userData);
c. sha.GetHash(userData);
d. sha.EncryptHash(userData);

Back 322

b

Front 323

Which of the following code snippets will you use to encrypt an array called userData that can be decrypted by anyone logged in on the current machine, and without using any entropy?
a. ProtectedData.Protect(userData, null,
DataProtectionScope.CurrentUser);
b. ProtectedData.Protect(userData, null,
DataProtectionScope.LocalMachine);
c. ProtectedData.Encrypt(userData, null,
DataProtectionScope.CurrentUser);
d. ProtectedData.Unprotect(userData, null,
DataProtectionScope.LocalMachine);

Back 323

b

Front 324

Which of the following code will you use to encrypt an array called encryptedData that can be encrypted by the current user, and without using any entropy?
a. ProtectedData.Unprotect(encryptedData,
null, DataProtectionScope.CurrentUser);
b. ProtectedData.Protect(encryptedData, null,
DataProtectionScope.LocalMachine);
c. ProtectedData.Decrypt(encryptedData, null,
DataProtectionScope.CurrentUser);
d. ProtectedData.Unprotect(encryptedData,
null, DataProtectionScope.LocalMachine);

Back 324

a

Front 325

What describes a strong name assembly?
a. Name
b. Version
c. Public key token
d. Culture
e. Processor Architecture
f. All the above

Back 325

f

Front 326

How can you deploy a strong named assembly?
a. By running gacutil.exe
b. By creating an installer
c. By running asm.exe
d. By copying the file to the Bin folder of the application
e. By running regsvcs.exe

Back 326

a, b, d

Front 327

How can you deploy a private assembly?
a. By running gacutil.exe
b. By adding a reference to the assembly in Visual Studio
c. By copying the file in the Bin folder of the application
d. By copying the file in C:\Windows folder

Back 327

b, c

Front 328

What is a strong name assembly?
a. An assembly with the name marked as bold
b. An assembly with a major and minor version specified
c. An assembly with a full version specified
d. An assembly with the culture info specified
e. A signed assembly

Back 328

e