I had a slight variation while I was in school ...
There was this girl that I found quite attractive in my lecteur. She just sat about 5 or 6 seats away from me alone and we would always smile at each other and have eye contact with the occsional "Hi, how are yah?"
Anyway, when one of us missed the lecteur and bump into each other on campus we would be like "hey ... didn't see you in class today, are you alright? Are you sick?" Obviously we notice each other alot and cared whether the other went to class or not.
Anyway, I was too shy to ask her for her contact info. So knowing her full name, I did a search on the school directory and found her e-mail address. I e-mailed her numerous times but never got a reply ...
Finally, at the end of the semester, during exam period, I asked her straight up why she doesn't answer my e-mails. And her reply was that she doesn't use the school e-mailing system. I knew she was lying and avoiding me and thought that I was cowardly and disrespectful for obtaining her e-mail "illegally" because ALL students used the school e-mailing system for administrative purposes.
But anyway, I graduated and left and we never had any contact with each other again.
Moral of the story? Be respectful and ask HER for her contacts. Don't get it anywhere else, cause when you do contact her, she wold freak!