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The extra, short-circuited Or Else operator was a compromise between Microsoft's desire to tighten up Boolean evaluations and a VB developer's not wanting modified logic behavior (although who these VB developers were is unknown).
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True) End If End If End Sub End Class You can do as poojavb has stated, but if you are using this textbox for input in a database, you will have to be sure that the user can't submit the changes when the textbox is empty (contains default mask) or it will blow up.
Small, incremental changes to existing controls can be the best way to extend . Small changes are easy to implement and test and can add real value.
The following code example uses the derived class Text Box and validates an e-mail address that the user enters.
If the e-mail address is not in the standard format (containing "@" and "."), the validation fails, an Error Provider icon is displayed, and the event is canceled.