arduino conect to C#

아두이노랑 Serial 입력하는 방법

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO.Ports;

namespace Serial
{
    class Program
    {
        static void Main(string[] args)
        {
            SerialPort ObjSerial = new SerialPort();
            ObjSerial.PortName = "COM3";
            ObjSerial.BaudRate = 9600;
            ObjSerial.DataBits = 8;
            ObjSerial.Parity = Parity.None;
            ObjSerial.StopBits = StopBits.One;
            ObjSerial.Open();
            ObjSerial.Write("5");

            ObjSerial.Close();

        }
    }
}

Serial.Read(); 로 5 들어오는 거랑 똑같이 동작