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In a form, I have a combo box from which the user can select either Phone or Email. I also have an Email text box on the form. How can I make the Email text box field required only when Email is selected in the combo box? Thanks for the help.

I have a field with the US phone number mask applied. I can validate the first 3 digits of the field to require a valid area code, but how can I validate the remaining 7 digits to prevent users from doing an end run around the required field by entering all zeros instead of a vaild phone number?