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Create a validation formula and message

1. In design time, right-click the field or control for which you want to create a validation formula, and then click Properties on the shortcut menu.
   
   
2. Click the Validation page.
   
   
3. Select the Validate this field before closing the form check box.
   
   
4. In the Validation Formula box, enter the formula that you want to use for evaluating user input.
   
   
5. In the Display this message if the validation fails box, type the text that you want to appear in the message.