Raspberry Pi 2 IoT LED Demo

       private const int LED_PIN = 6;
        private const int PB_PIN = 5;
        private GpioPin pin;
        private GpioPin pushButton;
        private DispatcherTimer timer;
        private GpioPinValue pushButtonValue;

        public MainPage()
        {
            InitializeComponent();

            timer = new DispatcherTimer();
            timer.Interval = TimeSpan.FromMilliseconds(1);
            timer.Tick += Timer_Tick;
            timer.Start();

            Unloaded += MainPage_Unloaded;

            InitGPIO();
        }

        private void InitGPIO()
        {
            var gpio = GpioController.GetDefault();

            if (gpio == null)
            {
                pin = null;
                return;
            }
            pushButton = gpio.OpenPin(PB_PIN);
            pin = gpio.OpenPin(LED_PIN);

            pushButton.SetDriveMode(GpioPinDriveMode.Input);
            pin.Write(GpioPinValue.Low);
            pin.SetDriveMode(GpioPinDriveMode.Output);

        }

        private void MainPage_Unloaded(object sender, object args)
        {
            pin.Dispose();
            pushButton.Dispose();
        }

        private void FlipLED()
        {
            pushButtonValue = pushButton.Read();
            if (pushButtonValue == GpioPinValue.High)
            {
                pin.Write(GpioPinValue.High);
            }
            else if (pushButtonValue == GpioPinValue.Low)
            {
                pin.Write(GpioPinValue.Low);
            }
        }

        private void Timer_Tick(object sender, object e)
        {
            FlipLED();
        }