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public Guid NewSequentialID()
{
   var destinationArray = Guid.NewGuid().ToByteArray();

   var time = new DateTime(0x76c, 1, 1);
   var now = DateTime.Now;

   var span = new TimeSpan(now.Ticks - time.Ticks);
   var timeOfDay = now.TimeOfDay;

   var bytes = BitConverter.GetBytes(span.Days);
   var array = BitConverter.GetBytes((long) (timeOfDay.TotalMilliseconds / 3.333333));

   Array.Reverse(bytes);
   Array.Reverse(array);

   Array.Copy(bytes, bytes.Length - 2, destinationArray, destinationArray.Length - 6, 2);
   Array.Copy(array, array.Length - 4, destinationArray, destinationArray.Length - 4, 4);

   return new Guid(destinationArray);
}

Note: Code is from Doug posted on StackOverflow: Sequential guid in linq to sql

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