true if the membership user was successfully unlocked; otherwise, false. A value of false is also returned if the user does not exist in the database.
Users are most commonly locked out and cannot be validated by the SqlMembershipProvider.ValidateUser(string, string) method when the SqlMembershipProvider.MaxInvalidPasswordAttempts is exceeded within the SqlMembershipProvider.PasswordAttemptWindow.
Leading and trailing spaces are trimmed from the username parameter value.