private void charactersComboBox_SelectionChanged(object sender, System.Windows.Controls.SelectionChangedEventArgs e) { switch (CharactersComboBox.SelectedIndex) { case 0: EmailValidator.SetAsciiSpecialCharsDefault(); break; case 1: EmailValidator.SetExtendedAsciiSpecialChars(); break; case 2: EmailValidator.SetExtendedQuotedAsciiSpecialChars(); break; default: throw new NotSupportedException(); } }