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Abstract Class in C#

Abstract Class in C#

An Abstract Class means that, no object of this class can be instantiated, but can make derivation of this. It can serve the purpose of base class only as no object of this class can be created.Abstract Class is denoted by the keyword abstract.

The abstract keyword enables you to create classes and class members that are incomplete and must be implemented in a derived class.

An abstract class cannot be instantiated. The purpose of an abstract class is to provide a common definition of a base class that multiple derived classes can share. For example, a class library may define an abstract class that is used as a parameter to many of its functions, and require programmers using that library to provide their own implementation of the class by creating a derived class.

Abstract classes may also define abstract methods. This is accomplished by adding the keyword abstract before the return type of the method.

Rules:

1.Derived classes of the abstract class must implement all abstract methods.

2.We can not create object for Abstract Class

3.Abstract class may contains non abstract members.

4.when implementing abstract methods we should use override keyword in derived class

example:

an abstract class can be derive another abstract class

Example:

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