TeamMentor requires a stronger random number generator https://github.com/TeamMentor/Master/issues/258

CheckPerfomanceRunCryptoGuidCreation.cs

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Security.Cryptography;
using System.Threading.Tasks;

namespace Wimiro.Spike.RNGCryptoGuid {
    class Program {
        static void Main(string[] args)
        {
            var watch = Stopwatch.StartNew();

            Task.Run(() => RunGuidCreation(watch));
            Task.Run(() => RunCryptoGuidCreation(watch));

            Console.ReadLine();
        }

        private static void RunGuidCreation(Stopwatch watch)
        {
            var guids = new List<Guid>();
            for (var i = 0; i < 10000000; i++)
            {
                guids.Add(Guid.NewGuid());
            }
            Console.WriteLine("RunGuidCreation: " + string.Format("{0:n0}", watch.ElapsedMilliseconds));
        }

        private static void RunCryptoGuidCreation(Stopwatch watch) {
            var guids = new List<Guid>();
            for (var i = 0; i < 10000000; i++) {

                guids.Add(CSPRNG.GetGuid());
            }
            Console.WriteLine("RunCryptoGuidCreation: " + string.Format("{0:n0}", watch.ElapsedMilliseconds));
        }

        public static class CSPRNG {
            public static byte[] GetBytes(int entropy) {
                if (entropy < 8) {
                    throw new ArgumentOutOfRangeException("entropy",
                        "Entropy must be 64 bits or greater to be cryptographically secure.");
                }
                using (RNGCryptoServiceProvider _rng = new RNGCryptoServiceProvider()) {
                    byte[] _obj = new byte[entropy];
                    _rng.GetBytes(_obj);
                    return _obj;
                }
            }

            public static Guid GetGuid() {
                using (RNGCryptoServiceProvider _rng = new RNGCryptoServiceProvider()) {
                    byte[] _obj = new byte[16];
                    _rng.GetBytes(_obj);
                    return new Guid(_obj);
                }
            }

            public static long GetInt64(bool allowNegativeValue = false) {
                using (RNGCryptoServiceProvider _rng = new RNGCryptoServiceProvider()) {
                    byte[] _obj = new byte[8];
                    _rng.GetBytes(_obj);
                    long _num = BitConverter.ToInt64(_obj, 0);
                    if (!allowNegativeValue) {
                        _num = (_num & ~(1L << 63));
                    }
                    return _num;
                }
            }
        }
    }
}

here is this code converted to a C# REPL script:

https://gist.github.com/DinisCruz/5420818

And here it is on the web REPL; http://csharp-repl.apphb.com/37