we are talking about two things, right? The login part is independant from or the profile part you are trying to develop.
In the profile page, for example, if you are trying to list for a new user all of the articles he/she has written, as in the example given by Sonu, then I suggest you use a datalist for the task. Moreover, since you like to use AJAX, I suggest you use the DataList in the ADC suite. The difference between an ADC datalist and a asp .net DataList is that the ADC is a client-side control, it uses very often a web service as its datasource. ...
To me, both are ok for your purpose.