public AddBookPage(Publisher publisher, bool isAddToCatalogue)
 {
     InitializeComponent();
     BindingContext  = new AddBookViewModel(Navigation, publisher, isAddToCatalogue);
     BackgroundColor = App.Current.MainPage.BackgroundColor;
 }
 public AddBookPage()
 {
     InitializeComponent();
     BindingContext  = new AddBookViewModel(Navigation);
     BackgroundColor = App.Current.MainPage.BackgroundColor;
 }