SeqentialGuidFactory

    public static class SeqentialGuidFactory {

        static long s_currentSequentialBase;
        static long s_sequentialGuidCounter;

        static SeqentialGuidFactory() {
            Random rnd = new Random(Guid.NewGuid().ToString().GetHashCode());
            s_currentSequentialBase = rnd.Next();
        }

        public static long CurrentSequentialBase {
            get {
                if(s_currentSequentialBase <= 0)
                    s_currentSequentialBase = new Random().Next();
                return s_currentSequentialBase;
            }
            set { s_currentSequentialBase = value; }
        }

        public static Guid Create() {

            var ticksAsBytes = BitConverter.GetBytes(s_currentSequentialBase);

            Array.Reverse(ticksAsBytes);
            var increment = System.Threading.Interlocked.Increment(ref s_sequentialGuidCounter);
            var currentAsBytes = BitConverter.GetBytes(increment);

            Array.Reverse(currentAsBytes);

            var bytes = new byte[16];
            Array.Copy(ticksAsBytes,0,bytes,0,ticksAsBytes.Length);
            Array.Copy(currentAsBytes,0,bytes,8,currentAsBytes.Length);
            return new Guid(bytes);
        }

    }