private void DGV_NewCars_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            try
            {
                if (RoleType == "Administrator" || RoleType == "Manager")
                {
                    if (DGV_NewCars.Items.IsEmpty)
                    {
                        AddNewVehicles VnewCar = new AddNewVehicles();
                        NVehicle_page.Navigate(VnewCar);
                    }
                    else
                    {
                        upNewCars = new UpdateNewVehicle();
                        object item = DGV_NewCars.SelectedItem;
                        upNewCars.txt_Brand.Text  = (DGV_NewCars.SelectedCells[1].Column.GetCellContent(item) as TextBlock).Text;
                        upNewCars.txt_Color.Text  = (DGV_NewCars.SelectedCells[4].Column.GetCellContent(item) as TextBlock).Text;
                        upNewCars.txt_Model.Text  = (DGV_NewCars.SelectedCells[2].Column.GetCellContent(item) as TextBlock).Text;
                        upNewCars.txt_Price.Text  = (DGV_NewCars.SelectedCells[5].Column.GetCellContent(item) as TextBlock).Text;
                        upNewCars.txt_serial.Text = (DGV_NewCars.SelectedCells[3].Column.GetCellContent(item) as TextBlock).Text;
                        ID           = (DGV_NewCars.SelectedCells[0].Column.GetCellContent(item) as TextBlock).Text;
                        upNewCars.ID = ID;

                        NVehicle_page.Navigate(upNewCars);
                    }
                }

                else
                {
                }
            }
            catch (Exception)
            {
            }
        }
        private void Can_AddNewCar_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            ViewNewCar = new ViewNewVehicles();
            AddNewCar  = new AddNewVehicles();

            ViewNewCar.NVehicle_page = null;
            DependencyObject currParent = VisualTreeHelper.GetParent(this);

            while (currParent != null && ViewNewCar.NVehicle_page == null)
            {
                ViewNewCar.NVehicle_page = currParent as Frame;
                currParent = VisualTreeHelper.GetParent(currParent);
            }

            if (ViewNewCar.NVehicle_page != null)
            {
                ViewNewCar.NVehicle_page.Source = new Uri("AddNewVehicles.xaml", UriKind.Relative);
            }
        }