public ListNhanVienPage()
        {
            var x = new SQLiteNhanVienStore(DependencyService.Get <ISQLite>());

            this.BindingContext = new ListNhanVienViewModel(x);
            InitializeComponent();
        }
        //private ListNhanVienPageViewModel ViewModel;
        public ListNhanVienPage()
        {
            var pageService = new PageService();
            var dataAccess  = new SQLiteNhanVienStore(DependencyService.Get <ISQLite>());

            ViewModel = new ListNhanVienPageViewModel(dataAccess, pageService);
            InitializeComponent();
        }
        public DetailNhanVien(NhanVienViewModel x)
        {
            var dataAccess  = new SQLiteNhanVienStore(DependencyService.Get <ISQLite>());
            var pageService = new PageService();

            ViewModel           = new DetailNhanVienViewModel(x, dataAccess, pageService);
            this.BindingContext = ViewModel;
            InitializeComponent();
        }