/// <summary>
        /// Uploads files & form values
        /// </summary>
        /// <param name="url">The form action url.</param>
        /// <param name="files">The files to upload.</param>
        /// <param name="form">The form values.</param>
        /// <returns>Returns the http response.</returns>
        public static string Upload(string url, UploadFile[] files, NameValueCollection form)
        {
            HttpWebRequest r = (HttpWebRequest)WebRequest.Create(url);

              Upload(r, files, form);

              WebResponse resp = r.GetResponse();

              using (Stream s = resp.GetResponseStream())
              using (StreamReader sr = new StreamReader(s)) {
                  return sr.ReadToEnd();
              }
        }
        /// <summary>
        /// Uploads files & form values
        /// </summary>
        /// <param name="req">A web request.</param>
        /// <param name="files">Files to upload.</param>
        /// <param name="form">Form values to upload.</param>
        public static void Upload(HttpWebRequest req, UploadFile[] files, NameValueCollection form)
        {
            List<MimePart> mimeParts = new List<MimePart>();

            try
            {
                foreach (string key in form.AllKeys)
                {
                    StringMimePart part = new StringMimePart();

                    part.Headers["Content-Disposition"] = "form-data; name=\"" + key + "\"";
                    part.StringData = form[key];

                    mimeParts.Add(part);
                }

                int nameIndex = 0;

                foreach (UploadFile file in files)
                {
                    StreamMimePart part = new StreamMimePart();

                    if (string.IsNullOrEmpty(file.FieldName))
                        file.FieldName = "file" + nameIndex++;

                    part.Headers["Content-Disposition"] = "form-data; name=\"" + file.FieldName + "\"; filename=\"" + file.FileName + "\"";
                    part.Headers["Content-Type"] = file.ContentType;

                    part.SetStream(file.Data);

                    mimeParts.Add(part);
                }

                string boundary = "----------" + DateTime.Now.Ticks.ToString("x");

                req.ContentType = "multipart/form-data; boundary=" + boundary;
                req.Method = "POST";

                long contentLength = 0;

                byte[] _footer = Encoding.UTF8.GetBytes("--" + boundary + "--\r\n");

                foreach (MimePart part in mimeParts)
                {
                    contentLength += part.GenerateHeaderFooterData(boundary);
                }

                req.ContentLength = contentLength + _footer.Length;

                byte[] buffer = new byte[8192];
                byte[] afterFile = Encoding.UTF8.GetBytes("\r\n");
                int read;

                using (Stream s = req.GetRequestStream())
                {
                    foreach (MimePart part in mimeParts)
                    {
                        s.Write(part.Header, 0, part.Header.Length);

                        while ((read = part.Data.Read(buffer, 0, buffer.Length)) > 0)
                            s.Write(buffer, 0, read);

                        part.Data.Dispose();

                        s.Write(afterFile, 0, afterFile.Length);
                    }

                    s.Write(_footer, 0, _footer.Length);
                }

                // return (HttpWebResponse)req.GetResponse();
            }
            catch
            {
                foreach (MimePart part in mimeParts)
                    if (part.Data != null)
                        part.Data.Dispose();

                throw;
            }
        }