using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO.Ports;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        private SerialPort _serialPort;

        public Form1()
        {
            InitializeComponent();

            _serialPort = new SerialPort("COM3");

            _serialPort.BaudRate = 9600;
            _serialPort.Parity = Parity.None;
            _serialPort.StopBits = StopBits.One;
            _serialPort.DataBits = 8;
            _serialPort.Handshake = Handshake.None;

            _serialPort.DataReceived += SerialPortOnDataReceived;
        }

        private void SerialPortOnDataReceived(object sender, SerialDataReceivedEventArgs serialDataReceivedEventArgs)
        {
            var data = _serialPort.ReadExisting();
            this.Invoke((Action)delegate
            {
                this.textBox1.Text = data;
            });
        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.toolStripStatusLabel1.Text = "Connecting...";
            if (!_serialPort.IsOpen)
            {
                _serialPort.Open();
            }
            this.toolStripStatusLabel1.Text = string.Format("Receiving data on port {0}...", _serialPort.PortName);
        }

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                if (components != null)
                {
                    components.Dispose();
                }

                if (_serialPort != null)
                {
                    _serialPort.Dispose();
                }
            }
            base.Dispose(disposing);
        }
    }
}