Exactly as you described and Fred said. You need both places - textbox valid and PreSaveHook. If you don't want to notify user right away, you may program your validation only in PreSaveHook. In the MereMortals framework you create business rules for business objects and they are invoked when data are trying to be saved.

>What is the simplist way to always ensure that data is entered into a textbox on a form?
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>If the textbox looses focus, I want to alert the user to the of the requirement. Likewise, I want the user to be notified of this requirement when they try to save the record even if the textbox has been skipped and never received focus. In other words, I want to prevent the user from saving the record until data is added to the textbox.
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>I've made a couple of attempts writing code to check if the .Value of the txtbox is EMPTY() but this isn't working too well. Is there a better way?
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>Thanks,
>Robert