I am trying add validation before a link is created between two nodes through AnchorPoints.

So I have added ValidateAnchorPoint event to the diagram. Here is my dummy code looks like.

Boolean b1 = true.
private void diagram_ValidateAnchorPoint(object sender, LinkValidationEventArgs e)
{          
   if (b1)
        e.Cancel = true;
}

So I assume in the above case as b1 is true and I am cancelling the event, the link should not be created between the nodes. But it does not seems to work the way I assume. Am I heading a wrong direction?