Validating event in vb net
For example, you might want to have a routine that fires on the form's “Closing” event or a data save method to loop through all the controls on your form and validate them independently to ensure that all controls are valid.
This might be a common scenario in data entry forms where you might create a new record and the user might not touch all the fields on your form (and thus never trigger the “Validating” event of your controls). One, pointed out by Chris Sells (read more), invokes the Control's “Notify Validating” event through Reflection.
NET controls is in the order in which they fire the Lost Focus and Validate events.
VB6 controls fire the Validate event first and then the Lost Focus event; if the Validate sets Cancel=True, then the Lost Focus event is never fired.
Focus Event Support static property to True: When this property is True, the support library ensures that the Lost Focus event is always fired after the Validate event.
Notice that in the previously described scenario – the end user moves the focus away with the mouse but the control fails to validate – then a pair of Lost Focus/Got Focus events is fired anyway (unlike VB6), but this is seldom a problem.
Text Changed End Sub Public Sub Text Box1_Validating(By Val sender As Object, _ By Val e As System.
Here is an example: You can also trigger the Validation event by giving focus to a control and taking the focus away.
You might even loop through all the controls on your form and focus each of them individually (or an individual control by giving it focus then changing the focus to another control), achieving the same effect: Which solution is better?
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