for vingrad

private Stream StreamResp
        {
            get;
            set;
        }

        /// <summary>Загрузка изображения на сервер</summary>
        /// <param name="pngImage">
        /// Искомое изображение
        /// </param>
        /// <exception cref="WebException">Возникает при ошибке отправки на сервер</exception>
        public override void UploadImage(Bitmap pngImage)
        {
            // Init
            var cultureInfo = CultureInfo.InvariantCulture;
            const string Filename = "picture.png";
            const string MimeType = "image/png";
            var imageFormat = ImageFormat.Png;

            // Prepare POST contents...
            using (var memoryStream = new MemoryStream())
            {
                // Parts boundary
                var boundary = "-------" + DateTime.Now.Ticks.ToString("x", cultureInfo);
                const string Crlf = "\r\n";

                // Image file...
                var data = "--" + boundary + Crlf;
                var dataBytes = Encoding.ASCII.GetBytes(data);
                memoryStream.Write(dataBytes, 0, dataBytes.Length);

                data =
                    String.Format(
                    cultureInfo,
                    "Content-Disposition: form-data; name=\"fileupload\"; filename=\"{0}\"",
                    Filename) + Crlf;
                dataBytes = Encoding.ASCII.GetBytes(data);
                memoryStream.Write(dataBytes, 0, dataBytes.Length);

                data = String.Format(cultureInfo, "Content-Type: {0}", MimeType) + Crlf;
                dataBytes = Encoding.ASCII.GetBytes(data);
                memoryStream.Write(dataBytes, 0, dataBytes.Length);

                memoryStream.Write(Encoding.ASCII.GetBytes(Crlf), 0, Crlf.Length);
                pngImage.Save(memoryStream, imageFormat);

                memoryStream.Write(Encoding.ASCII.GetBytes(Crlf), 0, Crlf.Length);

                // передаем ключ
                var parameters = new NameValueCollection
                                                        {
                                                            {
                                                                "key",
                                                                KeyDevelop
                                                            }
                                                        };

                foreach (var paramName in parameters.Keys)
                {
                    var paramValue = parameters.Get(paramName.ToString());

                    data = "--" + boundary + Crlf;
                    dataBytes = Encoding.ASCII.GetBytes(data);
                    memoryStream.Write(dataBytes, 0, dataBytes.Length);

                    data = String.Format(cultureInfo, "Content-Disposition: form-data; name=\"{0}\"", paramName) + Crlf;
                    dataBytes = Encoding.ASCII.GetBytes(data);
                    memoryStream.Write(dataBytes, 0, dataBytes.Length);

                    memoryStream.Write(Encoding.ASCII.GetBytes(Crlf), 0, Crlf.Length);

                    data = paramValue;
                    dataBytes = Encoding.ASCII.GetBytes(data);
                    memoryStream.Write(dataBytes, 0, dataBytes.Length);

                    memoryStream.Write(Encoding.ASCII.GetBytes(Crlf), 0, Crlf.Length);
                }

                // End...
                data = "--" + boundary + Crlf;
                dataBytes = Encoding.ASCII.GetBytes(data);
                memoryStream.Write(dataBytes, 0, dataBytes.Length);

                // Prepare web connection...
                ServicePointManager.Expect100Continue = false;
                var webRequest = (HttpWebRequest)WebRequest.Create("http://www.imageshack.us/upload_api.php");
                webRequest.ContentType = "multipart/form-data; boundary=" + boundary;
                webRequest.Method = "POST";

                // Посылаем запрос POST
                webRequest.ContentLength = memoryStream.Length;
                using (var requestStream = webRequest.GetRequestStream())
                {
                    memoryStream.Seek(0, SeekOrigin.Begin);
                    memoryStream.WriteTo(requestStream);
                }

                try
                {
                    var webResponse = webRequest.GetResponse();
                    this.StreamResp = webResponse.GetResponseStream();
                }
                catch (WebException exception)
                {
                    throw new WebException(exception.Message);
                }
            }
        }