Learning Visual Basic 2008 C Glossary Definitions

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a keyword that may be optionally used to call a procedure

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Call

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a button on a form that is clicked when the user presses the – key

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cancel button

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file containing HTML styles that affect the appearance of text and graphics on Web pages

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Cascading Style Sheet (CSS)

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a button on the Properties window that causes related properties to be displayed in groups

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Categorized button

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a Boolean property; when the focus is shifting from Control A to Control B, and Control B's CausesValidation property is set to True, Control A's Validating event will fire

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CausesValidation property

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the part of the computer that fetches instructions, carries out operations commanded by the instructions, and produces some outcome

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central processing unit (CPU)

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a box that is checked or unchecked when clicked with the mouse

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CheckBox

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CheckBox control

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allows the user to make yes/no or on/off selections; may appear alone or in groups

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looks like a group of check boxes, but works like a list box

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CheckBoxList control

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occurs when the state of a radio button or check box changes

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CheckedChanged event

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A property of radio buttons and check boxes; it is set to True when the control is selected and False when the control is deselected. Also a MenuItem object property that may be set to True or False; when set to True, the object becomes a checked menu item.

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Checked property

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an intrinsic function that accepts a character code as an argument and returns the character that corresponds to the code

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Chr function

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a program structure that defines an abstract data type

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class

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defines a class and member variables, properties, events, and methods

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class declaration

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the portion of a class that is hidden from client programs

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class implementation

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the portion of a class that is visible to the application programmer who uses the class

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class interface

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instances of a class

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class objects

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a variable that has class scope

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class-level variable

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when you declare a variable inside a class; also known as module scope

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class scope

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entity that consumes data and makes requests of a server

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client

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a program written to use a class; this term is in reference to the clientserver relationship between a class and the programs that use it

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client program

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describes interaction between users of a program (the clients) and the server (as in a Web server)

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client-server model

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closes a form and releases its visual par from memory

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Close method

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a form event procedure that executes after a form has closed

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Closed event handler

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a form event procedure that executes as a form is in the process of closing, but before it has closed

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Closing event handler

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stores the source code for a Web form

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codebehind file

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code that is automatically inserted into an event procedure, consisting of the first and last lines of the procedure; you must add the code that appears between these two lines

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code template

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a Visual Studio tool that lets you expand and collapse sections of code

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code outlining

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a text-editing window in which you write code

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Code window

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an object that is similar to an array; it is a single unit that contains several items and dynamically expands or shrinks in size as items are added or removed

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collection

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allows the user to select a color

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Color dialog box

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displays a Color dialog box

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ColorDialog control

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the vertical lists of data in a database table

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columns

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combine an arithmetic operator with an assignment operator

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combined assignment operators

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similar to list boxes; display lists of items to the user

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combo boxes

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a control that is the combination of a ListBox and a TextBox

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ComboBox

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notes of explanation that document lines or sections in a method; also known as remarks

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comments

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- typically written in languages such as C or Perl; process information collected by HTML controls

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Common Gateway Interface (CGI)

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- syntax errors, such as misspelled keywords and incorrect use of operators or punctuation; statements containing compile errors are underlined with a jagged blue line

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compile errors

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special controls in Visual Basic that provide the linking mechanism in a database

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components

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resizable region at the bottom of the Design window that holds invisible controls

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component tray

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combine an arithmetic operator with an assignment operator

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compound operators or combined assignment operators

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describes statements that are only performed when certain conditions exist

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conditionally-executed

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provides the low-level functionality to interact with a data source

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connection object

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a flowcharting symbol used to connect two flowcharts when a flowchart does not fit on a single sheet of paper or must be divided into sections

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connector symbol

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a method that is automatically called when an instance of the class is created

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constructor

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on the Dynamic Help window; displays a table of contents in which related help topics are organized into groups

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Contents button

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a pop-up menu that is displayed when the user right-clicks a form or control

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context menu

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a help screen that is displayed when the ! key is pressed (for the item that is currently selected)

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context-sensitive help

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a value that can be concatenated with a string to produce multiple line displays

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ControlChars.CrLf

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objects, usually used as on-screen elements in a Visual Basic application

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controls

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a collection property that holds the number of items in the collection

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Count property

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a variable that is regularly incremented or decremented each time a loop iterates

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counter