private static void WriteFormDatum(Stream stream, string name, string value, string boundary) { byte[] bytes = Encoding.UTF8.GetBytes(string.Format(CultureInfo.InvariantCulture, "--{0}\r\nContent-Disposition: form-data; name=\"{1}\"\r\n\r\n{2}\r\n", boundary, name, value)); stream.Write(bytes, 0, bytes.Length); } }