private void Window_Loaded(object sender, RoutedEventArgs e) { dpNgaysinh.SelectedDate = DateTime.Now; xl = new CXulySinhvien(); dc = new QLKTXDataContext(); cmbMaphong.ItemsSource = dc.PHONGs.ToList(); xl.kiemtra(); dgDSSVDango.ItemsSource = xl.getDSSinhienViewDango(); dgDSSVDao.ItemsSource = xl.getDSSinhienViewDao(); }