Oop

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Key Concepts of Object Orientation

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•Abstraction
•Encapsulation
•Polymorphism
•Inheritance.

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Abstraction is the ability to

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generalize an object as a data type that has a specific set of characteristics and is able to perform a set of actions.

Object-oriented languages provide abstraction via classes.

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abstraction example

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You can create an abstraction of a dog with characteristics, such as color, height, and weight, and actions such as run and bite. The characteristics are called properties, and the actions are called methods.

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Early binding means

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that our code directly interacts with the object, by directly calling its methods. Since the compiler knows the object's data type ahead of time, it can directly compile code to invoke the methods on the object. Early binding also allows the IDE to use IntelliSense to aid our development efforts; it allows the compiler to ensure that we are referencing methods that do exist and that we are providing the proper parameter values.

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Late binding means

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that our code interacts with an object dynamically at run-time. This provides a great deal of flexibility since our code literally doesn't care what type of object it is interacting with as long as the object supports the methods we want to call. Because the type of the object isn't known by the IDE or compiler, neither IntelliSense nor compile-time syntax checking is possible but we get unprecedented flexibility in exchange.

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Inheritance is the idea that

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one class, called a subclass, can be based on another class, called a base class. Inheritance provides a mechanism for creating hierarchies of objects.

Inheritance is the ability to apply another class's interface and code to your own class

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The base keyword is used to

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access members of the base class from within a derived class:

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C# gives us polymorphism through

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inheritance. C# provides a keyword virtual that is used in the definition of a method to support polymorphism.

Child class are now free to provide their own implementation of this virtual method, that is called overriding.

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What is AppSetting Section in “Web.Config” file?

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Web.config file defines configuration for a web project. Using “AppSetting” section, we can define user-defined values. Example below defined is “Connection String” section, which will be used through out the project for database connection.