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In my windows form I have an area for the user to enter a phone number (American).
There are many different way to display this info...
(###) ###-####
###.###.####
#-###-###-#### x### (where x is an extension)

How can I force the input, no matter what the user types or pastes, to be in the format of '###-###-####'? If there is an extension it could be added at the end in format 'x###', but is not necessary.
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Maciej Los 15-May-15 15:41pm    
Sean, what you mean by saying "extension"?

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