How to break a heavy loop by a pressing a button

Question

Hi.
I am developing an application to perform video processing. I would like to interrupt the process (break the loop) by pressing a "Stop"button, that changes the value of a flag in the while loop. However, when I press the stop button the application stops responding. I am working with C# Express 2008.
If any idea, please post it. Thanks in advance.

John Penn · Answer

Can you post your loop code?

Luis Fernando · Answer

Thanks for replying John but your idea does not overcome the problem.

John Penn · Answer

Try adding the following line to the end of your processing loop: System.Threading.Thread.Sleep( 1 );