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  if (System.IO.File.Exists(@"C:\\temp.jpg"))
            {
                // Use a try block to catch IOExceptions, to 
                // handle the case of the file already being 
                // opened by another process. 
                try
                {
                    System.IO.File.Delete(@"C:\\temp.jpg");
                }
                catch (System.IO.IOException e)
                {
                    //  Console.WriteLine(e.Message);
                    //   return;
                }
            }
            // bild runterladen

            try
            {
                WebClient Webclient1 = new WebClient();
                Webclient1.DownloadFile(bildx.Text, @"C:\temp.jpg");

                // Bild öffnen
                FileStream imageStream = new FileStream("C:\\temp.jpg", FileMode.Open, FileAccess.Read);

                // Image der Picturebox setzen
                pictureBox_bildx.Image = System.Drawing.Image.FromStream(imageStream);

            }
            catch (Exception ex)
            {
               

                MessageBox.Show("keine Bild gefunden");

            }                    

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  WebClient Webclient1 = new WebClient();
  var bytes = await Webclient1.DownloadDataTaskAsync(bildx.Text);

  // Bild öffnen
  using (var imageStream = new MemoryStream(bytes)) {
    // Image der Picturebox setzen
    pictureBox_bildx.Image = System.Drawing.Image.FromStream(imageStream);
  }