TestGenerics.cs

using System;
using System.Collections.Generic;
using System.Text;
 
namespace TestGenerics
{
    class Program
    {
        static void Main(string[] args)
        {
            MyList myList = new MyList();
            myList.Add(1);
            myList.Add(2);
            myList.Add(3);
 
            myList.Print();
 
            Console.WriteLine("Now the 2nd List");
            
            My2ndList my2ndList = new My2ndList();
            my2ndList.Add(1);
            my2ndList.Add(2);
            my2ndList.Add(3);
 
            my2ndList.Print();
        }
 
    }
 
    public class MyList : List<int>
    {
        new private void Add(int item)
        {
            item *= 10;
            base.Add(item);
        }
 
        public void Print()
        {
            foreach (int item in this)
                Console.WriteLine(item.ToString());
        }
    }
 
    public class My2ndList : MyList
    {
        new private void Add(int item)
        {
            item *= 100;
            base.Add(item);
        }
    }
}