Abstract methods

When an instance method declaration includes an abstract modifier, that method is said to be an abstract method. Although an abstract method is implicitly also a virtual method, it cannot have the modifier virtual.

An abstract method declaration introduces a new virtual method but does not provide an implementation of that method. Instead, non-abstract derived classes are required to provide their own implementation by overriding that method. Because an abstract method provides no actual implementation, the method-body of an abstract method simply consists of a semicolon.

Abstract method declarations are only permitted in abstract classes

public abstract class AbstractClass

{

public abstract void PrintName();

}

Implementation

public sealed class AbstractImp1:AbstractClass

{

public override void PrintName()

       {

           Console.WriteLine("Im Aruna");

}

}

Calling

AbstractClass abs = new AbstractImp1();

abs.PrintName();