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