How do you ask a professor out?

I want to possibly date one of my professors. I know I can't date him while I am still in student in school. But I want to do it after I graduate. I want to set it up in such a way that he wouldn't be shocked when I do ask him out.

I plan on going to office hours, really get to know them, show plenty of interest in their subject, get all the "help" I can get from them. Maybe hold their gaze or check them out to let them know I am into him. Anything else I can do to increase my chances of him liking me back or saying "yes".

How do you ask a professor out?
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