Tom

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

namespace ConsoleApplication1
{
    class Program
    {
        public static char Chr(byte src)
        {
            return (System.Text.Encoding.GetEncoding("iso-8859-1").GetChars(new byte[] { src })[0]);
        }
        static void Main(string[] args)
        {
            Dictionary<String,String> nDic = new Dictionary<String,String>();
            int i;
            int x;
            Random rnd = new Random();
            Int64 tTimer = DateTime.Now.Ticks;
            for (i = 1; i <= 1000000; i++)
            {

                // Generate a random UUID
                String pUUID="";
                for (x = 1; x <= 16; x++)
                {
                    pUUID += Chr((byte)rnd.Next(0, 255));

                }

                //Check if pUUID exists in the dictionary
                if (!nDic.ContainsKey(pUUID))
                {
                    //If not, add it to the dictionary
                    nDic.Add(pUUID, pUUID);
                }


            }

            tTimer = DateTime.Now.Ticks - tTimer; //Stop the clock!
            Console.WriteLine("Operation completed in " + ((double)tTimer / (double)TimeSpan.TicksPerSecond).ToString());
            Console.WriteLine(nDic.Count.ToString() + " keys in dictionary");

            //Keep the window open at the end of the test
            while (true) ;

        }
    }
}