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Sorry for the slow reply. I'm out of town and logging in is tricky.
The only thing that springs to mind is that the event handler may not be hooked up to the button. On Solution Explorer, click the events button and make sure your button's click event is hooked up.
Rod, thank you for your reply and help! Finally, I've found my error. I changed Calculate's dialog result to cancel by mistake. That's why my form was closed and nothing happened.
Regards, Ilya.
