WPF - Dispatcher.BeginInvoke - Why doesn't this work

Hi..
I have a SAVE method. I'm trying to display a graphic while saving, when the save button is clicked.
I'm trying to use the BeginInvoke before and after the save to show the graphic. But the graphic is never shown. it looks like this... What is wrong..? How do I update the UI????
thanks

void  Save()
{


// SHOW GRAPHIC


            System.Threading.Thread thread = new System.Threading.Thread(
            new System.Threading.ThreadStart(
              delegate()
              {
                  System.Windows.Threading.DispatcherOperation
                    dispatcherOp = this.spinner.Dispatcher.BeginInvoke(
                    System.Windows.Threading.DispatcherPriority.Normal,
                    new Action(
                      delegate()
                      {
                          this.spinner.Spin = true;
                         this.spinner.Visibility = Visibility.Visible;
                      }
                  ));

                  dispatcherOp.Completed += new EventHandler(dispatcherOp_Completed);
              }
          ));

            thread.Start();



//  DO SAVE

///  Long running save here

// HIDE Graphic



            System.Threading.Thread thread2 = new System.Threading.Thread(
            new System.Threading.ThreadStart(
              delegate()
              {
                  System.Windows.Threading.DispatcherOperation
                    dispatcherOp = this.spinner.Dispatcher.BeginInvoke(
                    System.Windows.Threading.DispatcherPriority.Normal,
                    new Action(
                      delegate()
                      {
                          this.spinner.Spin = false;
                         this.spinner.Visibility = Visibility.Collapsed;
                      }
                  ));

                  dispatcherOp.Completed += new EventHandler(dispatcherOp_Completed);
              }
          ));

            thread2.Start();






/// DONE



}
LVL 1
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AndyAinscowFreelance programmer / ConsultantCommented:
Just looking at your code I don't see why you use another thread to set two properties and run the save operation in the main thread (== blocks UI updates ?).

Why not have the save operation in another thread instead?


(There is a DoEvents method, maybe you could use it inside the portion of code that is performing the save if you didn't re-organise).
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