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

namespace chapter1
{
    public class Collection : CollectionBase
    {
        public void Add(Object item)
        {
            List.Add(item);            
        }
        public void Remove(Object item)
        {
            List.Remove(item);
        }
        public new void  Clear()
        {
            List.Clear();
        }
        public new int Count()
        {
            return List.Count;
        }
    }
    class chapter1
    {
        static void Main(string[] args)
            {
                Collection names = new Collection();
                names.Add("David");
                names.Add("Bernica");
                names.Add("Raymond");
                names.Add("Clayton");
                foreach (Object name in names)
                    Console.WriteLine(name);
                Console.WriteLine("Number of names: " + names.Count());
                names.Remove("Raymond");
                Console.WriteLine("Number of names: " + names.Count());
                names.Clear();
                Console.WriteLine("Number of names: " + names.Count());
                Console.ReadKey();
            }
        }
    }