Timer and GUI

One cannot use the System.Timers.Timer to update the GUI, instead one gets a cross-thread exception. The GUI can't be updated from another thread.

A nice trick to solve this is to use a method that is sensitive for if the call comes from another thread than the GUI is running on.

   private delegate void SetTextDelegate(Label label, string text);

   private void SetText(Label label, string text)
   {
       if (this.InvokeRequired)
       {
           IAsyncResult res = BeginInvoke(new SetTextDelegate(SetText), label, text);
           EndInvoke(res);
       }
       label.Text = text;
   }

Honor those who should.