private void Customer_EndDate_SelectedDateChanged(object sender, SelectionChangedEventArgs e)
        {
            var reportCustomer = BaoCaoCongNoBUS.loadReport(Global.Customers, Customer_StartDate.SelectedDate.Value.ToString(), Customer_EndDate.SelectedDate.Value.ToString());

            Global.CustomerReport = reportCustomer;
            if (reportCustomer != null)
            {
                ListViewCustomerReports.ItemsSource = Global.CustomerReport;
            }
        }
        private void Page_Loaded(object sender, RoutedEventArgs e)
        {
            var reports = BaoCaoTonSachBUS.loadReportBook(Global.Books, "1990-01-01", DateTime.Now.ToString());

            Global.BookReport = reports;
            ListViewBookReports.ItemsSource = Global.BookReport;

            var reportCustomer = BaoCaoCongNoBUS.loadReport(Global.Customers, "1990-01-01", DateTime.Now.ToString());

            Global.CustomerReport = reportCustomer;
            if (reportCustomer != null)
            {
                ListViewCustomerReports.ItemsSource = Global.CustomerReport;
            }
        }