public ListedCarsViewModel()
 {
     selectedCar = new CarEntity();
     cars        = new ObservableCollection <CarEntity>();
     foreach (var c in DatabaseExecutes.GetCarEntities())
     {
         cars.Add(c);
     }
 }
 public override void Execute(object parameter)
 {
     if (parameter.Equals("Upload"))
     {
         UploadPhoto();
     }
     else if (parameter.Equals("See"))
     {
     }
     else if (parameter.Equals("Back"))
     {
     }
     else if (parameter.Equals("Save"))
     {
         DatabaseExecutes.AddCarEntity(car);
     }
 }