For a long time I thought that I only had to set the Cursor.Current to a WaitCursor before a long running operation, the .NET runtime would reset it back to the Default cursor. Turns out that this is only true when the mouse is moved. Bummer.
// mouse is moved and the application is idle!
Cursor.Current = Cursors.WaitCursor;
The solution for this problem is very easy. I created a helper class called WaitCursor which set the Cursor.Current and restores it to the original value when it it disposed.
 private Cursor _prev;
 public WaitCursor(){
   _prev= Cursor.Current;
   Cursor.Current = Cursors.WaitCursor;
 }
 publicvoid Dispose(){
   Cursor.Current =_prev;
 }
}
I create the instance of the WairCursor class inside a using statement. This will automatically call the Dispose() method when it goes out of scope.
 // long running operation, for example:
 System.Threading.Thread.Sleep(1000);
}
Afterwards I did some searching around on the web. Turns out I'm not the first to come up with this solution. Charlie Poole already posted it a few years ago. Another bummer.
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