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Validating event visual basic

The new Visual Basic 6 validation mechanism is simple and can be implemented with little effort.But it isn't the magic answer to all your validation needs.

If Unload Mode = vb Form Control Menu Then On Error Resume Next Validate Controls If Err = 380 Then ' The current field failed validation.

This allows all controls to be validated and checked with almost no code.

I have a form with a textbox and numerous panels, buttons and other controls. However, certain buttons on the form (such as a cancel button) I don't want causing the validation code to run, so I set their Causes Validation property to False. I still get the validating code executed in situations I don't want it.

If this property is True, Visual Basic fires the Validate event in the control that's about to lose the focus, thus giving the programmer a chance to validate its contents and, if necessary, cancel the focus shift. Imagine that you have five controls on a form: a required field (a Text Box control, txt Required, that can't contain an empty string), a numeric field, txt Numeric, that expects a value in the range 1 through 1000, and three push buttons: OK, Cancel, and Help.

(See the figure below.) You don't want to perform validation if the user presses the Cancel or Help buttons, so you set their Causes Validation properties to False.


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