public IActionResult PreBooking()
        {
            #region lay session
            SearchVM  Request = HttpContext.Session.GetObject <SearchVM>(SessionManager.Request);
            BookingVM b       = HttpContext.Session.GetObject <BookingVM>(SessionManager.Booking);
            #endregion

            #region tao model
            PreBookingVM model = new PreBookingVM();
            model.Request = Request;
            model.Tickets.Add(_item.GetItemById(b.VeDi));
            FareVM DepartFare = new FareVM();
            DepartFare.DanhSach.Add(new Fare()
            {
                HanhKhach = "Người lớn", SoLuong = Request.NguoiLon, GiaVe = Request.NguoiLon * _item.GetDiscount(b.VeDi, 1) * model.Tickets[0].Gia
            });
            DepartFare.DanhSach.Add(new Fare()
            {
                HanhKhach = "Trẻ em", SoLuong = Request.TreEm, GiaVe = Request.TreEm * _item.GetDiscount(b.VeDi, 2) * model.Tickets[0].Gia
            });
            DepartFare.DanhSach.Add(new Fare()
            {
                HanhKhach = "Em bé", SoLuong = Request.EmBe, GiaVe = Request.EmBe * _item.GetDiscount(b.VeDi, 3) * model.Tickets[0].Gia
            });
            model.Fares.Add(DepartFare);
            model.HanhLyXT.Add((int)_context.ChiTietHangVe.Where(s => s.id_HangVe == Request.HangVe && s.id_HangBay == _item.GetIdHangBay(b.VeDi)).Select(s => s.HanhLyXt).SingleOrDefault());
            if (b.VeVe != -1)
            {
                model.Tickets.Add(_item.GetItemById(b.VeVe));
                FareVM ReturnFare = new FareVM();
                DepartFare.DanhSach.Add(new Fare()
                {
                    HanhKhach = "Người lớn", SoLuong = Request.NguoiLon, GiaVe = Request.NguoiLon * _item.GetDiscount(b.VeVe, 1) * model.Tickets[1].Gia
                });
                DepartFare.DanhSach.Add(new Fare()
                {
                    HanhKhach = "Trẻ em", SoLuong = Request.TreEm, GiaVe = Request.TreEm * _item.GetDiscount(b.VeVe, 2) * model.Tickets[1].Gia
                });
                DepartFare.DanhSach.Add(new Fare()
                {
                    HanhKhach = "Em bé", SoLuong = Request.EmBe, GiaVe = Request.EmBe * _item.GetDiscount(b.VeVe, 3) * model.Tickets[1].Gia
                });
                model.Fares.Add(ReturnFare);
                model.HanhLyXT.Add((int)_context.ChiTietHangVe.Where(s => s.id_HangVe == Request.HangVe && s.id_HangBay == _item.GetIdHangBay(b.VeVe)).Select(s => s.HanhLyXt).SingleOrDefault());
            }
            #endregion

            return(View(model));
        }