Abstract Class in c#.net

Abstract Class:

Now we will discuss about abstract class in c#.net.

·         Abstract class is class we cannot create object. We only use inherit

·         We are only use base class. If u r use abstract method u must implement derived class

Abstract Class Declaration

abstract class devenvexe

{

}

A abstract class can contain  abstract method or non-abstract method .abstract method not have implementation in abstract class .but same its have derived class

Abstract Method/Non Abstract Method:

abstract class devenvexe

{ 

public abstract void abstractMethod();

public void NonAbstractMethod()

    {

        Console.WriteLine("NonAbstract Method");

    }

}

Rules:

·         Abstract class not have sealed class

·         Abstract class only contain abstract method

·         Abstract class cannot be private

·         Abstract method cant have virtual keyword.because its  explicit virtuval method

·         Abstract class cannot be static

Performance

In our testing, abstract classes with virtual methods have better performance than interface implementation .