using System;

using System.Numerics;

public class Program

{

    public static void Main()

    {

            Guid guid = Guid.NewGuid();

            var bint = new BigInteger(guid.ToByteArray());

            byte[] bytes = new byte[16];

            bint.ToByteArray().CopyTo(bytes, 0);

            var guido = new Guid(bytes);

​

            if (guid.Equals(guido))

                Console.WriteLine("they are equal");

    }

}