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Definition: Method signature in base class as well as in derived class should be same.

If you are not satisfied with the implementation of a method in the parent class, you can keep the same declaration (signature and return type), but provide a different implementation.

Important Points::

  1. By using virtual and override keywords we can accomplish Method overriding.
  2. The virtual modifier indicates to derived classes that they can override this method.
  3. The override modifier allows a method to override the virtual method of its base class at run-time.

To achieve Run-time polymorphism or Late Binding, we are using Method Overriding concept.

Here, I am writing a simple program.

using System;

using System.Collections.Generic;

using System.Text;

namespace ConsoleApplication3


class baseclass


public virtual int Add(int a, int b)


return a + b;



class subclass : baseclass


public override int Add(int x, int y)


int d = 20;

return base.Add(x,y)+d;



class subclass2 : baseclass


public int Add(int x, int y)


int d = 40;

return base.Add(x, y) + d;



class something


public static void Main(String[] args)

baseclass baseclsinst = new baseclass();

Console.WriteLine(“Base class Addition::::::::::::” + baseclsinst.Add(23, 23));

baseclass bscls = new subclass();

Console.WriteLine(“Derived class addition:::::::::” + bscls.Add(34, 54));

baseclass bscls2 = new subclass2();

Console.WriteLine(“Derived class addition:::::::::” + bscls2.Add(34, 54));






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