using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class A
    {
        int value = 5;
        public int prop
        {
            get { return value; }
            set { this.value = value; }
        }
    }
    class B : A
    {
        public B()
        {
            prop = 10;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            A myclass = new B();
            Console.WriteLine(myclass.prop);
            Console.ReadKey();
        }
    }
}