Abstract Class Concept in C#.net

Hello Friends,

            Now I am going to describe anather OOP concept of C# dotnet.Generally Abstraction is a concept through which we can see only assential part of the object ,we can't see the background details or inner part of the object.

                               If we will see the real world example than this concept will be cleared.when we are watching TV then through our Remote we controls any operations means we can move one chanel to anather chanel to enjoy different programs that can be news,songs and serial etc.

             But matter is that when we are enjoying any program in TV at that time we don't try to see any background part of TV like picture tube,circute,electronics chips etc and we donot know about it's internal process or how it work.

        Finally we can say that it is a concept through which the essential part of the object will represented hiding the background detail.It leads to data hiding and data hiding leads to data security.

Ex:

Abstract Class:

       Abstract class is a type of class whose data member and member function can be accessed in derived class.The members of abstract class can be private as well as protected.It is define by abstract key word.

Ex:

using System;

namespace abstractclass
{
abstract class abstractprog
{

 

 //Non abstract method
public void myabstractprog(string s)
{
Console.WriteLine (s.Length);
}
//abstract method
public abstract void myabstract(int i, int j);

public static void Main(string[] args)
{
mainclass obj = new mainclass();
obj.myabstractprog("rabi");
obj.myabstract(10,20);
}
}
class mainclass:abstractprog
{
public override void myabstract(int i, int j)
{
Console.WriteLine (i*j);
}
}
}

OutPut:

4 

200 

Thanks & Regard

Rabi