Public Overridable Sub Cancel() 

Dim instance As AnnAutomation
 
instance.Cancel()

public virtual void Cancel()

public:
virtual void Cancel(); 

Public Sub AnnAutomation_Cancel()
   ' subclass to the viewer mouse move event
   ' _automation is an AnnAutomation object
   AddHandler _automation.Viewer.MouseMove, AddressOf viewer_MouseMove
End Sub
Private Sub viewer_MouseMove(ByVal sender As Object, ByVal e As MouseEventArgs)
   ' check if we have a draw designer currently selected
   If Not _automation.CurrentDesigner Is Nothing AndAlso TypeOf _automation.CurrentDesigner Is AnnDrawDesigner Then
      ' check if we are over the rectangle 100,100 to 200,200
      Dim rc As Rectangle = New Rectangle(100, 100, 100, 100)
      If rc.Contains(e.X, e.Y) Then
         _automation.Cancel()
      End If
   End If
End Sub

public void AnnAutomation_Cancel()
{
   // subclass to the viewer mouse move event
   // _automation is an AnnAutomation object
   _automation.Viewer.MouseMove += new MouseEventHandler(viewer_MouseMove);
}
private void viewer_MouseMove(object sender, MouseEventArgs e)
{
   // check if we have a draw designer currently selected
   if (_automation.CurrentDesigner != null && _automation.CurrentDesigner is AnnDrawDesigner)
   {
      // check if we are over the rectangle 100,100 to 200,200
      Rectangle rc = new Rectangle(100, 100, 100, 100);
      if(rc.Contains(e.X, e.Y))
         _automation.Cancel();
   }
}