Dropdown list in Editable GridView

Before creating this new thread, I searching and found this thread
http://www.vbforums.com/showthread.p...pdown+gridview

It talks about making gridview editable but it didnt answer what I was looking for.

On my web page, user selected initial data from dropdown and on submit two dropdowns and a gridview is displayed. This gridview is editable (has dropdowns in cols). So far, it is all good.

Now, when user makes selection in gridview, he has to save each row seperately and click update for each row. After they have made all selections in dropdowns, they have to again submit the page as I need values

What I am looking for is way in which there is only one submit button, I can do the batch update on gridview, get values selected in other controls and return one final result back to user.

I dont know how is this possible using gridview....how do you save all changes at one time instead of saving changes in each row.

any tips or pointers appreciated. thanks.