public ActionResult Create(TripCreateVM tripVm)
        {
            if (ModelState.IsValid)
            {
                var trip = tripVm.convertToTrip();
                db.Trips.Add(trip);
                db.SaveChanges();
                return(RedirectToAction("Create", "Budgets", new { id = trip.Id }));
            }

            ViewBag.CustId = new SelectList(db.Customers, "CustId", "First_Name", tripVm.CustId);
            return(View(tripVm));
        }