private async void AddTrip(object sender, RoutedEventArgs e)
 {
     if (Validate())
     {
         if (await AddTripViewModel.AddTrip(AddTripName.Text, AddTripLocation.Text, AddTripStartDate.Date.Value.DateTime, AddTripEndDate.Date.Value.DateTime) != null)
         {
             ToastService.MakeToast(string.Format(ResourceLoader.GetString("AddTripCreated"), AddTripName.Text));
             Frame.Navigate(typeof(TripOverview));
         }
     }
 }
 private async void RegisterUser(object sender, RoutedEventArgs e)
 {
     if (Validate())
     {
         if (await ValidateEmail())
         {
             if (await RegisterViewModel.Register(RegisterEmail.Text, RegisterPassword.Password,
                                                  RegisterFirstname.Text, RegisterLastname.Text) == "SUCCESS")
             {
                 Frame.Navigate(typeof(Login));
                 ToastService.MakeToast(string.Format(ResourceLoader.GetString("RegisterAccountCreated"), RegisterEmail.Text));
             }
         }
     }
 }