public static void DisplayScreen()
        {
            Reservation reservation = new Reservation();

            Console.Write("Car Plate:");
            var carPlate = Console.ReadLine();
            var carID    = ReservationManagement.ValidateCar(carPlate);

            reservation.CarID = carID;


            Console.Write("Client ID:");
            var clientID = ValidateUserInput.ValidateInputInt(Console.ReadLine());

            reservation.CostumerID = ReservationManagement.ValidateClient(clientID);


            Console.Write("Start Date(mm.dd.yyyy):");
            var startDate = ValidateUserInput.ValidateInputDate(Console.ReadLine());

            Console.Write("End Date(mm.dd.yyyy):");
            var endDate = ValidateUserInput.ValidateInputDate(Console.ReadLine());

            reservation.StartDate = ReservationManagement.ValidateDates(startDate, endDate).Item1;
            reservation.EndDate   = ReservationManagement.ValidateDates(startDate, endDate).Item2;


            Console.Write("Location:");
            var location = Console.ReadLine();

            reservation.LocationID = ReservationManagement.ValidateCarLocation(carID, location);


            List <Nullable <DateTime> > carReserved = ReservationManagement.IsCarAvailabe(carID, startDate, endDate);

            if (carReserved.Count() > 0)
            {
                Console.WriteLine("Car is not available on: " + carReserved);
                ReservationManagement.DisplayReservationInfo(reservation);
            }

            using (var db = new RentCDb())
            {
                Car car = db.Cars.Find(reservation.CarID);

                var     price = car.PricePerDay * (decimal)((endDate - startDate).TotalDays);
                decimal totalPrice;

                Console.WriteLine("The car is available for " + car.PricePerDay + "/day");
                Console.Write("Do you have a cupone code?\nIf yes enter it, if no type NO: ");
                var ans = Console.ReadLine();
                if (ans.ToUpper() == "NO")
                {
                    totalPrice = price;
                }
                else
                {
                    var customerCupon = Console.ReadLine();
                    var cupon         = db.Coupons.FirstOrDefault(c => c.CouponCode == customerCupon);
                    if (cupon != null)
                    {
                        Console.WriteLine("Discount: " + cupon.Discount + ": " + cupon.Description);
                        totalPrice = price - (cupon.Discount * price);
                    }
                    totalPrice = price;
                }

                Console.WriteLine("Total price: " + totalPrice);
                Console.WriteLine("Save the reservation? Type YES to save \nNO to go back to main menu: ");

                ans = Console.ReadLine();
                if (ans == "NO")
                {
                    MenuPage.SelectOption();
                }
                else
                {
                    reservation.ReservStatsID = 1;
                    db.Reservations.Add(reservation);
                    db.SaveChanges();
                }
            }
        }
        public static void UpdateRental()
        {
            //  Reservation reservation = GetReservation();


            Console.WriteLine("Please enter a reservationID");
            var reservationID = ValidateUserInput.ValidateInputInt(Console.ReadLine());

            using (var db = new RentCDb())
            {
                while (!db.Reservations.Any(r => r.ReservationID == reservationID))
                {
                    Console.WriteLine("Please enter a valid reservationID");
                    reservationID = ValidateUserInput.ValidateInputInt(Console.ReadLine());
                }
                var reservation = db.Reservations.Find(reservationID);
                ReservationManagement.DisplayReservationInfo(reservation);

Options:
                var ans = UpdateCarRentalOptions();

                switch (ans)
                {
                case "1":
                    Console.WriteLine("Please enter a new car Plate");
                    var carPlate = Console.ReadLine();
                    var carID    = ReservationManagement.ValidateCar(carPlate);
                    reservation.CarID = carID;
                    db.SaveChanges();
                    break;

                case "2":
                    Console.WriteLine("Please enter a Client ID:");
                    var clientID = ReservationManagement.ValidateClient
                                       (ValidateUserInput.ValidateInputInt(Console.ReadLine()));
                    reservation.CostumerID = clientID;
                    db.SaveChanges();
                    break;

                case "3":
                    Console.WriteLine("Please enter Start Date (mm.dd.yyy):");
                    var enteredStartDate = ValidateUserInput.ValidateInputDate(Console.ReadLine());
                    var validStartDate   = ReservationManagement.ValidateDates(enteredStartDate, reservation.EndDate).Item1;
                    reservation.StartDate = validStartDate;
                    db.SaveChanges();
                    break;

                case "4":
                    Console.WriteLine("Please enter End Date (mm.dd.yyy):");
                    var enteredEndDate = ValidateUserInput.ValidateInputDate(Console.ReadLine());
                    var validEndDate   = ReservationManagement.ValidateDates(reservation.StartDate, enteredEndDate).Item2;
                    reservation.EndDate = validEndDate;
                    db.SaveChanges();
                    break;

                case "5":
                    Console.WriteLine("Please enter a new location: ");
                    var enteredLocation = Console.ReadLine();
                    var newLocation     = ReservationManagement.ValidateCarLocation(reservation.CarID, enteredLocation);
                    reservation.LocationID = newLocation;
                    db.SaveChanges();
                    break;

                default:
                    Console.WriteLine("Option not available");
                    goto Options;
                }

                Console.WriteLine("New Reservation Data:");
                ReservationManagement.DisplayReservationInfo(reservation);
                Console.WriteLine("Would you like to modify something else? \n" +
                                  "If yes, type YES if no type NO to go back to main menu");
                ans = Console.ReadLine();
                if (ans.ToUpper() == "NO")
                {
                    MenuPage.SelectOption();
                }
                else if (ans.ToUpper() == "YES")
                {
                    goto Options;
                }


                db.SaveChanges();
            }
        }