ok, yeah that is a little unclear. You are trying to save names into an integer column in your database because your program requires that the names be integers????

maybe what is happening is that on the initial load, you have nothing selected in the list of classes, so when your second grid tries to load based on the the selected object in the first gridview,...

what's the error message?

gonna need to see more of the code. at a minimum, where you are setting up the database call and the connection between the gridview and the connection

ditto