Add Comments to Website using AJAX Modal Popup in ASP.Net

Hey Guys,

I have a asp.net web form on this form i want to add a button that when it is clicked a small window appears that would allow a user to enter a comment  and click save.  the saved comment will be stored to a table in an sql database, the user can also click cancel which will close the window.

The trick is i don't want the page to be reloaded on button click (post back)?  What web control would you guys recommend that i look at to accomplish this task?