title: AjaxControlToolkit AsyncFileUpload - how to modify a label text value in UploadedComplete event
body: <p>I am trying to set a label text value after a file is uploaded to the server using a AsyncFileUpload component in AjaxControlToolkit. But it seams it is ineffective, although the file uploader is green after the upload, and the upload works.</p>
  
  <pre><code>protected void AsyncFileUpload1_UploadedComplete(object sender, AjaxControlToolkit.AsyncFileUploadEventArgs e)
  {
      string filename  = System.IO.Path.GetFileName(AsyncFileUpload1.FileName);
      AsyncFileUpload1.SaveAs(Server.MapPath("Uploads/") + filename); 
      sourceLabel.Text="saved to "+filename; //this has no effect. I assume this is because the event is Async, but how can I set the value of  sourceLabel?
  }
  </code></pre>