using System;

public class Program

{

    public static void Main()

    {

        var userId = new Guid("f446ec5e-20a5-4452-94e1-0b5388f58f2c"); 

        byte[] ba = userId.ToByteArray();

        Console.WriteLine("With Math.Abs():");

        long firstHalf = Math.Abs(BitConverter.ToInt64(ba, 2));

        long secondHalf = Math.Abs(BitConverter.ToInt64(ba, 8));

        var combined = firstHalf ^ secondHalf;

        Console.WriteLine("\tUser Id: " + userId.ToString());

        Console.WriteLine("\tFirst Half: " + firstHalf);

        Console.WriteLine("\tSecond Half:" + secondHalf);

        Console.WriteLine("\tCombined: " + combined);

        Console.WriteLine("\tResult:" + Base36Extensions.ToBase36(combined));

        Console.WriteLine("Without Math.Abs()");

        long regFirstHalf = BitConverter.ToInt64(ba, 2);

        long regSecondHalf = BitConverter.ToInt64(ba, 8);

        var regCombined = regFirstHalf ^ regSecondHalf;

        Console.WriteLine("\tUser Id: " + userId.ToString());

        Console.WriteLine("\tFirst Half: " + regFirstHalf);

        Console.WriteLine("\tSecond Half:" + regSecondHalf);

        Console.WriteLine("\tCombined: " + regCombined);

        Console.WriteLine("\tResult:" + Base36Extensions.ToBase36(regCombined));

    }

}