Where should I ask her to the prom?

Have you been dating, or is she just a girl you want to take to prom? My boyfriend and I were just friends at the time he asked me. It was real casual, he took me to lunch and asked me if I'd go to prom with him. We agreed it would be fun because we are both outgoing people. If something like going for lunch is out of the picture, then ask her in the library. That way you have her attention, because it'll be quite.

There you should ask her in the Library then she can let you know off bat or if you want to be unexpected ask her in public open place.