Visual Basic.NET and XML

[sAlt_sHaKer]

Hi I have this school assignment, and I really need some help here.

I'm supposed to create a ASP.NET web application, and I'm having a problem with the login system.

Here's a simplified version of my problem:

When a user registers as a new member, his details are saved in two XML documents:

user_detail.xml (user_id, address, phoneno, dateloggedin)

login_detail.xml (user_id, loginname, password)

the user_id columns basically contain the count of the rows, eg. user1 will have "1", user2 will have "2", and so on. Each user has a unique user_id.

when a user is registered and logs in, the current date is recorded in the user_detail.xml's "dateloggedin" column, for that particular user.

so the problem is, how do I get it to record the current date and time for that particular user?


what I have done so far..
- passed the user_id of the person logging in into a string "i"

- declared a DataSet for user_detail.xml

what I wish to do (in pseudo code) is:

Search user_detail.xml's user_id column for the string "i" , and return the row

THEN

add Date.Now into the "dateloggedin" column for that particular row.

I know it's rather impolite to be asking homework help around here, but I really need some help here! thanks!