sending xml data by http post and get response

i am making an app in which user's data is send to a server...the data should be in xml format.

presently i have made a string and put all into it...like following format
NSString *s=[[NSString alloc]initWithFormat"<name>%@</name><address>%@</address>",name.text,address.text];

(this is just an example i have made a string with full xml tags including xml version tag)

and then send this through http post method....
i did it but dont know how to get response of server...please help ...any code will be helpful.....
waiting for answer