MARKUS

                    txtDecodeDownloadFile.Text = HttpUtility.UrlDecode(txtEncodeDownloadFile.Text,Encoding.UTF8);

                    txtEncodeDownloadFile.Text = HttpUtility.UrlEncode(txtDecodeDownloadFile.Text,Encoding.UTF8);

                string File = txtDecodeDownloadFile.Text;

                DownloadCurrent(File);

                //if (!System.IO.Directory.Exists(Savepath))

                //{

                //    System.IO.Directory.CreateDirectory(Savepath);

                //}

                //Markus.Service.Convert.ConvertService convertService = new Markus.Service.Convert.ConvertService();

                //var result = await convertService.DownloadFileAsync(new Markus.Message.SaveItem { PdfFilePath = File, SavePath = Savepath });

               // System.Windows.MessageBox.Show(result.ToString());

        private  void DownloadCurrent(string fileUri)

        {

            HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(fileUri);

            webRequest.Method = "GET";

            webRequest.Timeout = 3000;

            webRequest.Credentials = CredentialCache.DefaultCredentials;

            webRequest.BeginGetResponse(new AsyncCallback(PlayResponeAsync), webRequest);

        }

        private void PlayResponeAsync(IAsyncResult asyncResult)

        {

            long total = 0;

            long received = 0;

            HttpWebRequest webRequest = (HttpWebRequest)asyncResult.AsyncState;

            try

            {

                using (HttpWebResponse webResponse = (HttpWebResponse)webRequest.EndGetResponse(asyncResult))

                {

                    byte[] buffer = new byte[1024];

                    FileStream fileStream = File.OpenWrite(@"D:\Case\test.pdf");

                    using (Stream input = webResponse.GetResponseStream())

                    {

                        total = input.Length;

                        int size = input.Read(buffer, 0, buffer.Length);

                        while (size > 0)

                        {

                            fileStream.Write(buffer, 0, size);

                            received += size;

                            size = input.Read(buffer, 0, buffer.Length);

                        }

                    }

                    fileStream.Flush();

                    fileStream.Close();

                }

            }

            catch (Exception ex)

            {

            }

        }

        private  string ToHexString(char chr)

        {

            UTF8Encoding utf8 = new UTF8Encoding();

            byte[] encodedBytes = utf8.GetBytes(chr.ToString());

            StringBuilder builder = new StringBuilder();

            for (int index = 0; index < encodedBytes.Length; index++)

            {

                builder.AppendFormat("%{0}", Convert.ToString(encodedBytes[index], 16));

            }

            return builder.ToString();

        }