Suppress form repaints during calculations

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Question:

Is there a way to stop an application from painting during heavy calculations?

Answer:

Call LockWindowUpdate() on your MainForm. Your form will not be redrawn and cannot be moved until you unlock it by passing 0 as the window handle.
Note that LockWindowUpdate() does not hide the form nor does it reset the WS_VISIBLE style bit.

Also note that the final call of LockWindowUpdate(0) - which is required to unlock updates - will cause a lot of flicker as it repaints all application's visible windows/ controls.
Use this function with care only when absolutely necessary.

	LockWindowUpdate(MainForm.Handle); // pass the handle of window to lock // heavy calculation here LockWindowUpdate(0); // unlock it

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