using System;

//using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

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

        Console.WriteLine("");

        A a = new A();

        a.DoA();

        a.DoA2();

        a.DoA3();

        Console.WriteLine("");

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

        Console.WriteLine("");

        B b = new B();

        b.DoA();

        b.DoA2();

        b.DoA3();

        Console.WriteLine("");

        Console.WriteLine("------------AB-------------");

        Console.WriteLine("");

        A ab = new B();

        ab.DoA();

        ab.DoA2();

        ab.DoA3();

        Console.WriteLine("");

    }   

}

​

public class A

{

    public int varA {get;set;}

    int iVarA = 0;

    public void DoA()

    {

        Console.WriteLine("in DOA");

    }

    public virtual void DoA2()

    {

        Console.WriteLine("in DOA2");

    }

    public virtual void DoA3()

    {

        Console.WriteLine("in DOA3");

    }

}

​

public class B : A

{

    public int varB {get;set;}

    int iVarB = 0;

    int iVarB2 = 0;

    public int DoB()

    {

        return iVarB + iVarB2;

    }

    public new void DoA()

    {

        Console.WriteLine("in new DOA");

    }

    public override void DoA2()

    {

        Console.WriteLine("in override DOA2");

    }

    new public void DoA3()

    {

        Console.WriteLine("new in DOA3");

    }

}

​