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I had a problem getting the Windows Forms Invalidate() method to work on a
UserControl. Calling the method should force a repaint of the form, but the
repaint wasn't occuring. The solution is to add a call to the Update()
method immediately after the call to Invalidate(). The Update() call forces
the CLR to invalidate the form immediately:

 public void RedrawChart()
 {
      this.Invalidate();
      this.Update();
 }

David Veeneman
Foresight Systems