private void buttonVehicleDelete_Click(object sender, EventArgs e)
 {
     if (listBoxVehicle.SelectedItem != null)
     {
         if (listBoxVehicle.SelectedItem is Vehicle vehicle)
         {
             if (DBController.TryCheckOpenBookingVehicle(vehicle, out bool result))
             {
                 //If car isn't booked
                 if (!result)
                 {
                     DialogResult dialog = Feedback.AskVehicleDelete();
                     if (dialog == DialogResult.Yes)
                     {
                         //Try delete vehicle
                         if (DBController.TryDeleteVehicle(vehicle))
                         {
                             if (!DBController.TryCheckVehicleTypeIsNeeded(vehicle))
                             {
                                 Feedback.ErrorDatabaseVehicleTypeDelete();
                             }
                             Feedback.SuccessVehicleDelete();
                             FormController.MainView.UpdateVehicleList();
                         }
                         else
                         {
                             Feedback.ErrorDatabaseVehicleDelete();
                         }
                     }
                 }
                 else                         //If car is booked
                 {
                     Feedback.ErrorDatabaseBookedVehicleDelete();
                 }
             }
             else                     //If check fails
             {
                 Feedback.ErrorDatabaseConnection();
             }
         }
         else                 //If selected item isn't a vehicle
         {
             Feedback.ErrorNoValidSelectedItem();
         }
     }
     else             //If selected item is null
     {
         Feedback.ErrorNoSelectedItem();
     }
 }