using System;

​

namespace Generics  

{  

    class A  

    {  

        public virtual void show()  

        {  

            Console.WriteLine("Hello: Base Class!");  

            Console.ReadLine();  

        }  

    }  

    class B : A  

    {  

        public override void show()  

        {  

            Console.WriteLine("Hello: Derived Class!");  

            Console.ReadLine();  

        }  

    }  

​

​

public class Program

{

    public static void Main()

    {

        A a=new A();

        a.show();

        B b=new B();

        b.show();

        Console.ReadLine();

​

    }

}

}