private void btnThemTaiLieu_Click(object sender, RoutedEventArgs e)
{
navService = NavigationService.GetNavigationService(this);
AddTaiLieu pg = new AddTaiLieu(connectionString, this);
navService.Navigate(pg);
}
public TacGia(string connectionString, AddTaiLieu addTaiLieu = null)
{
InitializeComponent();
this.connectionString = connectionString;
_addTaiLieu = addTaiLieu;
get_dsTacGia();
}
