private int queryInterval = 2;  // query every 2s

        public MainPage()
        {
            Sensdata = new SensorAccess();
            InitializeComponent();
            //ShowData();
        }
        private int queryInterval = 2;  // query every 2s

        public MainPage()
        {
            Sensdata = new SensorAccess();
            InitializeComponent();
            //ShowData();
        }