using System;

using System.Collections.Generic;

using System.Numerics;                  

public class Program

{

    public static void Main()

    {

        var sHash = new Dictionary<int, Guid> ();

        var stHash = new Dictionary<int, Guid>();

        for(int i = 0 ; i< 250000; i++)

        {

            try {

                //var s = Guid.NewGuid().ToString().Replace("-","");

                var guidForS = Guid.NewGuid();

                //var bigIntS = new BigInteger(guidForS.ToString());

                var s =  BitConverter.ToInt64(guidForS.ToByteArray(), 0);

                 sHash.Add(s.GetHashCode(), Guid.Empty);

            //var st = s.Substring(7, 25);

                //stHash.Add(st.GetHashCode(), Guid.Parse(s));

            }catch(Exception ex){

                    Console.WriteLine("failure at " + i);

​

            }

    }

        Console.WriteLine("Success");

        }

}