>24x7 apps that are visible and updated by multiple users simultaneously often require validation in each control. In that case, it must be done in the valid or the lostfocus. When that is not a requirement, I prefer checking just prior to a global form save and then setting focus to the control with the problem.
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I believe the point that checking rules before the save is MANDATORY is an important one.

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>>>>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...
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>>>Users may disagree.
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>>>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.
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>>>Depends on the page and the user.
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>>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.