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The user name where the e-mail address for the user matches the specified e-mail address. If no match is found, null is returned.
Membership.GetUserNameByEmail(string) can be used to retrieve the user name for a membership user in the case where a user does not know their user name, but does know their e-mail address. If more than one user in the data store has the same e-mail address, the first user name encountered is returned.
Leading and trailing spaces are trimmed from all parameter values.