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 .