>>1 DON'T do something like tryin to hold her hand. Give her your attention, like looking over at her occasionally. It's flattering. Then if she doesn't look disgusted at catching your attention, then go over and give her a GOOD compliment(i.e. don't say something like, "whoa you got perky boobs"). A good compliment consists of commenting on her personality or a nonsexual observation on her appearance, like how you appreciate her style.
>>4 your dance moves probably weren't all that great. either that or you weren't aggressive enough in your approach to the girl.