How to make form center during start up depending on the screen resolution of the computer

My screen resolution is 1024 X 768 pixel .I have set the form start up as form center owner during design time. The form move to center of the screenduring start up.

But If I change the screen resolution to 1280 X 800 pixel, the form not appear on the center screen during start up but more to the right. How to make a form center in whatever resolution set on the computer screen