private void buttonUserDelete_Click(object sender, EventArgs e)
 {
     if (DBController.TryCheckOpenBookingsCustomer(FormController.CurrentCustomer, out bool result) && !result)
     {
         if (Feedback.AskOwnCustomerDelete() == DialogResult.Yes)
         {
             if (DBController.TryDeleteUser(FormController.CurrentCustomer))
             {
                 Feedback.SuccessOwnCustomerDelete();
                 FormController.MainView.Close();
             }
             else
             {
                 Feedback.ErrorDatabaseCustomersDelete();
             }
         }
     }
     else
     {
         Feedback.ErrorCustomerDeleteHimselfOpenBookings();
     }
 }