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This article explains how to use validation rules and validation text in table fields and form controls.
A validation rule is one way to restrict input in a table field or a control (such as a text box) on a form.
We used to demonstrate this as a thing to avoid in the VB4 classes back in 96 or so.
This is one of the reasons that they came up with the Validation event in VB5.
Usually, a record validation rule compares the values of two or more fields.
Tip: If you create a form automatically from a table by using one of the Form commands on the ribbon, any validation for fields in the underlying table are inherited by the corresponding controls on the form.
The steps in the section Add a validation rule to a table explain how to add validation rules to table fields.Access provides a number of ways to restrict input: You can use these methods of validating data alone or in combination with each other.Data types are not optional, and provide the most basic type of data validation. I placed all my validation codes in Validation Event and they are working smoothly without causing any trouble.
Regards Thanks Maj3091 What I was doing was a foolish way of validating in Lost Event. But I need to check Rate text box too for null value. But as soon as I write If-Else in Rate's Lost Focus Event to check nulls, Any mistake in Qty field (Null or Invalid Entry) causes program to stuck. If-Else in Rate's Lost Event should only fire for Rate field if its empty and moreover Rate field get focus only when Qty field is verified successfully that means Qty field has nothing to do. After struggling whole day, I figured out that I was not able to validate two consecutive text boxes i.e. I thought of validating all the boxes at end with a command button, but this step would have allowed the user to roam freely around the text boxes while entry and I wanted to restrict user to Input correct values or dont proceed further. I placed a new dummy text box outside the visible area on the form and then transfer the control to this Dummy Text Box from Qty field, Perform Validation for Qty and then from Dummy Text Box simply transfer the control to Rate Text Box.