private void can_Delete_MouseDown(object sender, MouseButtonEventArgs e) { connect = new CTUConnection();// refreshens the 'Connection' class // try { connect.DeleteInvoice(int.Parse(ID)); if (Department == 1) { connect.SelectInvoiceNewVehicle(); DGV_Invoice.ItemsSource = connect.table.DefaultView; } else if (Department == 2) { connect.SelectInvoiceOldVehicle(); DGV_Invoice.ItemsSource = connect.table.DefaultView; } else if (Department == 3) { connect.SelectInvoiceService(); DGV_Invoice.ItemsSource = connect.table.DefaultView; } else if (Department == 4) { connect.SelectInvoiceParts(); DGV_Invoice.ItemsSource = connect.table.DefaultView; } } catch (Exception) { } }