A helper class to convert UUIDv4 strings into bytes and back again with C#.

UUID.cs

using System;

public class UUID
{
    public static byte[] FromString(string uuid)
    {
        var guid = new Guid(uuid).ToByteArray();
        Array.Reverse(guid, 6, 2);
        Array.Reverse(guid, 4, 2);
        Array.Reverse(guid, 0, 4);
        return guid;
    }

    public static string FromBytes(byte[] uuid)
    {
        Array.Reverse(uuid, 0, 4);
        Array.Reverse(uuid, 4, 2);
        Array.Reverse(uuid, 6, 2);
        return new Guid(uuid).ToString();
    }
}

Usage example:

var session = "e6e11936-1ed2-4d8b-809d-79a1ae4a7e9b";
byte[] uuid = UUID.FromString(session);
string sout = UUID.FromBytes(uuid);
System.Console.WriteLine(string.Equals(session, sout));