public AddItemPage(AddItemViewModel viewModel)
        {
            InitializeComponent();

            var pageSerive = new PageService();
            var sqlCrud    = new SQLCrud(DependencyService.Get <ISQLDb>());

            BindingContext = viewModel;
        }
        public MainPage()
        {
            InitializeComponent();

            var pageService = new PageService();

            var sql = new SQLCrud(DependencyService.Get <ISQLDb>());

            BindingContext = new MainViewModel(pageService, sql);
        }