private void logoutButton_Click(object sender, RoutedEventArgs e)
{
StartingWindow startingWindow = new StartingWindow();
startingWindow.Show();
this.Close();
}
protected override void OnStartup(StartupEventArgs e)
{
base.OnStartup(e);
//MainWindow mv = new MainWindow();
//mv.Show();
StartingWindow sw = new StartingWindow();
sw.Show();
}