Endless calls of Control.OnMouseMove after calling Refresh

I was overriding the OnMouseMove method to write the current coordinates to my control. The problem is that I have to trigger the OnPaint method to refresh the values. If I use Refresh (开发者_开发知识库or even Invalidate) in the OnMouseMove an endless cascade of MouseMove events is triggered. Even if I don't move the mouse the events are raised with X and Y values zero. Why is that? And is there a better way to handle my problem than checking whether X and Y are zero before calling Refresh?

Thanks for help, Werner

I'm using .Net 3.5 on Windows XP and this topic is referring to System.Windows.Forms.

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Does your event handling cause another OnPaint invocation? Are you debugging where switching between VS.Net and your app is causing the repaint each time you hit the break point?