Nintendo Network password hash function in C#

NNHash.cs

        public string HashPassword(int Pid, string Password)
        {
            MemoryStream Stream = new MemoryStream();
            BinaryWriter Writer = new BinaryWriter(Stream);

            Writer.Write(Pid);
            Writer.Write(new byte[] { 0x02, 0x65, 0x43, 0x46 }); // Salt
            Writer.Write(Encoding.ASCII.GetBytes(Password));

            byte[] Hash = Sha256.ComputeHash(Stream.ToArray());

            return BitConverter.ToString(Hash).Replace("-", string.Empty);
        }