Download button does not display

Question

I have a weird problem..

I am working on creating a thumbnail of a webpage! I have never worked with threading and I have a issue

I am using the following code

protected void GetScreenshot_Click(object sender, EventArgs e)
{
  path = Server.MapPath(FolderID);
  Thread webBrowseThread = new Thread(new ThreadStart(PerformWebBrowseOp));
  webBrowseThread.SetApartmentState(ApartmentState.STA);
  webBrowseThread.Start();
}          

protected void PerformWebBrowseOp()
{
  if(searchedword!='')
  {
    Directory.CreateDirectory(path);
  }

  string path1 = Mypath + "/image.png";
  GeneateScreenshot gn = new GeneateScreenshot();
  Bitmap thumbnail = gn.GenerateScreenshot("http://www.google.com/search?hl=en&q=" + Searchedword, 1024, 768);
  FileStream imageStream = new FileStream(path1, FileMode.Create);
  thumbnail.Save(imageStream, System.Drawing.Imaging.ImageFormat.Png);
  imageStream.Close();
  downloadbutton.Visible=true;
}

now my problem is i have a download button to be displayed when the thumbnail has been created.. but for some reason the donwload button is not getting generated or is not visible!

I tried placing in the getscreenshot_click but it gets created even before the the thread has started running and before the thumbnail has been created.

Can someone help me fix this issue?

Answer 1

The simplest way to solve this problem was to use webBrowseThread.join() to wait till the process is done and then say downloadbutton.visible= true !