using System;
using System.Collections.Generic;

namespace First_program
{
    class parent
    {
        virtual public void msg(){
            Console.WriteLine("parent");
        }
    }
    class child1:parent
    {
        public new void msg(){
            base.msg();
            Console.WriteLine("child");
        }
    }
    class child2:parent
    {
        public override void msg(){
            base.msg();
            Console.WriteLine("child");
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            parent pr1 = new child1();
            parent pr2 = new child2();
            //////////this three?/////////
            parent pr    = new parent();//
            parent pr_ch = new child1();//
            child1 ch    = new child1();//
            //////////////////////////////
            pr1.msg();
            pr2.msg();

            Console.ReadKey();
        }
    }
}