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You can validate edit form data in the ASPx Grid View. If some column editor values are invalid, you need to add items to the e. As a result, error messages will be displayed near any column's editor to which an item has been added.
Important If you have custom validation that takes place after the Validating event, it will not affect the data binding.
For example, if you have code in a Validated event that attempts to cancel the data binding, the data binding will still occur.
To validate your controls, you will have to use explicit validation.
The explicit validation approach validates data at one time.
If you assigned Enable Prevent Focus Change, canceling the event will cause the Validated event not to occur.
Input focus will remain on the current control until the user changes the data to a valid input.
If you do not set the Cancel property, Windows Forms will assume that validation succeeded for that control, and raise the Validated event.
For a code example that validates an email address in a Text Box, see Validating.
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