>>I agree with this approach instead of using LostFocus or Valid. Another big advantage for me is being able to "read through" my error trapping in one location to be sure I haven't overlooked a case. That is a pain with individual error checking...
>
>Users may disagree.
>
>It can be much easier for a user to be presented with a validation message at the time they do something wrong - especially on a complicated page.
>
>Depends on the page and the user.
>
Imho, it could be used in both places, i.e. "save point" validation is mandatory (as a double-check, at least), and "on control" validation is optional by users request.