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- The Username / Email Changer control is a simple but powerful control that ensures username / email address hygiene through an easy to use and intuitive interface. The control uses regular expressions to validate email address syntax, in addition with a confirmation challenge. A dynamic status display provides users with all the necessary feedback to ensure the quality of their responses. The control also reduces round-trip time to the server by ensuring that the email addresses provided passes all tests prior to submitting a request.