I have a GridView that lists a bunch of items and one of the columns has a link that displays a modal (AjaxToolkit ModalPopupExtender). Let's call that link Show. In that modal, I have a asp:button for saving the data entered in that modal. Let's call that button Save

So when the user clicks on a Show link in a certain row, I'd like write some javascript that sets something in the Save button, so that in my code-behind, I can handle Save.Command and use the CommandEventArgs parameter to get the value.

Is this possible, or do I just need to use a hidden input tag and set its value?