private async Task UpdatePages(bool Admin)
        {
            if (IsAdmin)
            {
                lstPages.Add(new MasterPageItem {
                    Id = 4, Title = "Agregar vehículo", IconSource = "car.png"
                });
                lstReceived = await ReceiveCarModel.GetCars();

                lstPages.Add(new MasterPageItem {
                    Id = 5, Title = "Ver Consultas", IconSource = "car.png"
                });
            }
            else
            {
                var itemToRemove = lstPages.SingleOrDefault(r => r.Id == 4);
                if (itemToRemove != null)
                {
                    lstPages.Remove(itemToRemove);
                }

                itemToRemove = lstPages.SingleOrDefault(r => r.Id == 5);
                if (itemToRemove != null)
                {
                    lstPages.Remove(itemToRemove);
                }
            }
        }
        private async void ReceiveCar()
        {
            ReceiveCarModel car = new ReceiveCarModel();

            car.Brand       = CarBrand;
            car.Model       = CarModelo;
            car.Year        = CarYear;
            car.Miles       = CarMiles;
            car.Damage      = CarDamage;
            car.lstImagenes = lstImages;

            string saved = "";

            saved = await ReceiveCarModel.SaveCar(car, UserId);

            lstImages = new ObservableCollection <ImageFile>();
            if (Int32.Parse(saved) > 0)
            {
                lstImages = new ObservableCollection <ImageFile>();
                CarBrand  = "";
                CarModelo = "";
                CarYear   = 0;
                CarMiles  = 0;
                CarDamage = "";

                lstReceived = await ReceiveCarModel.GetCars();

                App.Current.MainPage.DisplayAlert("Success", "Su Consulta ha sido enviada", "OK");
                PageManager(1);
            }
            else
            {
                App.Current.MainPage.DisplayAlert("Error", "Se ha generado un error.", "OK");
            }
        }