using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        c C = new c();

        abstractb B = new d();

        interfacea A = new c();

        B.test2();

        A.test1();

        B.test3();

    }

}

​

class d : abstractb

{

    public override void test2()

    {

        Console.WriteLine("D-Ab-B");

    }

    //This will be printed if the object is of Type d

    //But if we are storing the obj in abstractb then this menthod even if shadowing will not work

    public new void test3()

    {

        Console.WriteLine("D is hinding test3()");

    }

}

class c : interfacea

{

    public void test1()

    {

        Console.WriteLine("C-In-A");

    }

}

​

interface interfacea

{

    void test1();

}

​

abstract class abstractb

{

    public abstract void test2();

    public void test3()

    {

        Console.WriteLine("ABC");

    }

}