async Task AddNewCar(Cars car)
 {
     await manager.SaveCarAsync(car);
 }
        public async void OnSaveRoute(object sender, EventArgs e)
        {
            bool validation = false;

            if (!properties.ContainsKey("route"))
            {
                await DisplayAlert("Error", "Select points in map", "accept");
            }
            else
            {
                if (string.IsNullOrEmpty((properties["route"] as Routes).From_Latitude) ||
                    string.IsNullOrEmpty((properties["route"] as Routes).To_Latitude))
                {
                    await DisplayAlert("Error", "Select points in map", "accept");
                }
                else
                {
                    if (string.IsNullOrEmpty(startingNameEntry.Text) || string.IsNullOrEmpty(endingNameEntry.Text) ||
                        string.IsNullOrEmpty(commentsEditor.Text))
                    {
                        await DisplayAlert("Error", "fill blank fields", "accept");
                    }
                    else
                    {
                        if (string.IsNullOrEmpty(seatsEntry.Text))
                        {
                            await DisplayAlert("Error", "Seats can't be null", "accept");
                        }
                        else
                        {
                            if (carPicker.SelectedIndex == -1)
                            {
                                await DisplayAlert("error", "select a car", "accept");
                            }
                            else
                            {
                                validation = true;
                            }
                        }
                    }
                }
            }

            if (validation == true)
            {
                newRoute             = (Routes)properties["route"];
                newRoute.From        = startingNameEntry.Text;
                newRoute.To          = endingNameEntry.Text;
                newRoute.Capacity    = Int32.Parse("" + seatsEntry.Text);
                newRoute.Comments    = commentsEditor.Text;
                newRoute.Depart_Time = departureTimePicker.Time.ToString();
                newRoute.ID_User     = currentUser.ID;

                DateTimeOffset dateRoute = new DateTimeOffset(departureDatePicker.Date.Add(departureTimePicker.Time));

                newRoute.Depart_Date = dateRoute.DateTime;
                newRoute.Depart_Time = departureTimePicker.Time.ToString();
                string carSelected = carPicker.Items.ElementAt(carPicker.SelectedIndex);
                Cars   car         = carsList.Where(cars => cars.Model + " " + cars.Color == carSelected).First();

                newRoute.ID_Car = car.ID;

                activityIndicator.IsRunning = true;
                await routeManager.SaveRouteAsync(newRoute);

                activityIndicator.IsRunning = false;

                await DisplayAlert("Success", "Route added successfully", "Accept");

                properties.Remove("route");
                await Navigation.PopAsync(true);
            }
        }