Forms Data Controls :: Gridview Row Selection Using Ajax?

I have requirement as such when user click on a Gridview row then i'll have to pick up the selected values [of row ] highlighting the gridview row into a form beneath the Gridview, later on the form user might or not update the details picked from the gridview . The form even contains a button on it , when the button is clicked i'll have save the changes [ if any made back to the datasource ] and got to progress to the next row automatically and perform the same updations .