using System;

using System.Collections.Generic;

using System.Linq;

abstract class C {

    public virtual void P() {

        Console.WriteLine("C.P");

    }

}

​

class C1 : C {

    public override void P() {

        Console.WriteLine("C1.P");

    }

}

​

class C2 : C {

    public new void P() {

        Console.WriteLine("C2.P");

    }

}

​

​

public class Program

{

    public static void Main()

    {

        var c1 = new C1();

        Console.Write("c1.P(): ");

        c1.P();

        var c2 = new C2();

        Console.Write("c2.P(): ");

        c2.P();

        C c01 = c1;

        Console.Write("c01.P(): ");

        c01.P();

        C c02 = c2;

        Console.Write("c02.P(): ");

        c02.P();

    }

}