Handle the click event for the button in the GridView.
Retrieve the button that was clicked from the
sender
parameter of the method that handles the click event.
Once you have the button, you can use it's
NamingContainer Property to retrieve the row that the button belongs to.
From the row, you can retrieve the data that it is bound to.
Store the object in session, or in cookies or however you want to so that you can pass this information to the next page.
-Frinny