System IO Ports C# by API

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using System;
using System.IO.Ports;
static class MainClass
{
    static void Main(string[] args)
    {
        using (SerialPort port = new SerialPort("COM1"))
        {
            // Set the properties.
            port.BaudRate = 9600;
            port.Parity = Parity.None;
            port.ReadTimeout = 10;
            port.StopBits = StopBits.One;
            // Write a message into the port.
            port.Open();
            port.Write("Hello world!");
            Console.WriteLine("Wrote to the port.");
        }
    }
}