Then, we'll demonstrate how you can use validation techniques to prevent bad data from being entered into your application in the first place.
Hi Lexi85, According to your description, as far as I know, the best way to validate phone number is regular expression. Here is a sample of validate America phone number, if you have some other phone number format, please provide specific format.
Sample Format(XXX-XXXXXXX): Sample Code: MSDN Community Support Please remember to click "Mark as Answer" the responses that resolved your issue.
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Or perhaps you simply didn't allow for a particular rare circumstance in your code. NET Framework offers a robust set of tools for dealing with these unexpected problems.