LedSample.Program.Main.cs

using System;
using System.Device.Gpio;
using System.Threading;

namespace LedSample
{
    public class Program
    {
        public static void Main()
        {
            var gpio = nanoFramework.M5Stack.M5Core2.GpioController;
            var led = gpio.OpenPin(19, PinMode.Output);

            nanoFramework.M5Stack.Console.Clear();
            while (true)
            {
                Console.WriteLine("LED ON");
                led.Write(PinValue.High);
                Thread.Sleep(2000);

                Console.WriteLine("LED OFF");
                led.Write(PinValue.Low);
                Thread.Sleep(2000);
            }
        }
    }
}