>>3
Hopefully that's a joke; because some girls will definitely find that really offending and freaky (as a way to start out a relationship.) Of course, there are girls who don't mind it; but it's typically not a great move (and might leave a bad impression...)

>>1
What is your current status with her? Friends? Acquaintance? Just classmates? Also, how long have you known her?

Aside from your status/familiarity with her; asking out is also about getting the right timing.