private void ExitButton_Click(object sender, RoutedEventArgs e)
{
CreateMailWindow createMailWindow = new CreateMailWindow();
createMailWindow.Show();
this.Close();
}
private void RemoveAllEmailButton_Click(object sender, RoutedEventArgs e)
{
helpQuery.RemoveAllEmail();
CreateMailWindow createMailWindow = new CreateMailWindow();
createMailWindow.Show();
this.Close();
}