word usage - ask for~ / ask someone to give ~

I saw a girl studying at a coffee shop and I thought she was beautiful.And a couple of weeks after I'd seen her studying at the coffee shop, I saw her dancing really hard at a club, when I thought she was so attractive that I

1. 
   

   could not help but ask for her phone number.

   
   


2. 
   

   could not help but ask her to give me her phone number.

   
   
   

I'm perfectly comfortable using "ask someone to ~" pattern, but I'd like to know if I can use "ask for~" in this context.

Answer

Yes, both are correct,

however, when you ask someone to get something, the pattern is ask somebody for something, example:

I asked John for his number.

if you say ask for something as

I asked for her number

it may also mean you asked the other people to give you her number