Create a validation rule for a control
Microsoft Access
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Right-click the form that you want to change, and then click Layout View.
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Right-click the control that you want to change, and then click
Click the
Tip: Click the Build button to start the Expression Builder.
For more information about using the Expression Builder, see the article Use the Expression Builder.
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Enter a message in the Validation Text property box.
OR
You can also