Biometric Authentication

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C#

I wrote the following code to capture an fingerprint from the nitgen biometric device.

if(axfpvx1.capture()==false)
messageBox.show("Image not captured");
else
messageBox.show("Image Captured");

My project has one mdi form and two forms. If i wrote the above code in other form of same project and while running the project if i click a menuitem and moved the second form to capture an fingerprint image it is throwing an error message called
"cannot allow auto redraw of an image"

What i have to do. In sdk there is a function called refresh to refresh the control buffer but its not working