In this Microsoft Access tutorial, I'm going to teach you how to use the On Unload event to perform data validation across multiple records and provide a friendly error message when you go to close a form in Microsoft Access.

Freya from Oslo, Norway (a Platinum Member) asks: I have a form where my employees enter a number of job codes for a particular project. Each job code is on a separate record. They have to enter at least five job codes but no more than eight. Is there any way I can check that before they're allowed to close the form?

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