Fixing the C# is slower the RealBasic myth...

// With reference to http://pastebin.com/f287a2609
using System;
using System.Collections.Generic;
using System.Text;

namespace HashSpeed
{
    class Program
    {
        static void Main(string[] args)
        {
            // Fix #1 - You are filling a dictionary with 1000000 values -
            // you better set up expectation with initial capacity
            Dictionary<string, int> nDic = new Dictionary<string, int>(1000000);
            int i;
            int x;
            Random rnd = new Random();
            Int64 tTimer = DateTime.Now.Ticks;

            // Fix #2 - User StringBuilder rather than string concatenations
            StringBuilder sb = new StringBuilder(16);
            Char[] chrs = new Char[16];

            for (i = 1; i <= 1000000; i++)
            {
                // Generate a random UUID
                for (x = 1; x <= 16; x++)
                {
                    // Fix #3 - No need to go via encoder, in C# int are cast-able to Char
                    chrs[x - 1] = (Char)rnd.Next(0, 255);
                }

                // Fix #4 - Better join all 16 chars in a single call
                String pUUID = sb.Clear().Append(chrs).ToString();

                //Check if pUUID exists in the dictionary
                if (!nDic.ContainsKey(pUUID))
                {
                    //If not, add it to the dictionary
                    nDic.Add(pUUID, 0);
                }
            }

            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
            // Fix #5 - Doing a while(1); is not a good way to wait for the user to end the program...
            Console.ReadKey();
        }
    }
}