Accelerometer _accelerometer;

        int _shakeCount = ;

        public MainPage()

        {

            this.InitializeComponent();

            _accelerometer=Accelerometer.GetDefault();

            if (_accelerometer != null)

                _accelerometer.Shaken += new TypedEventHandler<Accelerometer, AccelerometerShakenEventArgs>(Shaken);

        }

        async private void Shaken(object sender, AccelerometerShakenEventArgs e)

        {

            await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>

            {

                _shakeCount++;

            });

            if (_shakeCount >= )

            {

                //method call

                _shakeCount = ;

            }

        }