{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            serialPort1.BaudRate = 9600;
            serialPort1.PortName = "COM3";
            serialPort1.Open();
            serialPort1.DataReceived += serialPort1_DataReceived;
        }

        private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            string line = serialPort1.ReadLine();
            this.BeginInvoke(new LineReceivedEvent(LineReceived), line);
        }

        private delegate void LineReceivedEvent(string line);

        private void LineReceived(string line)
        {
            richTextBox1.Text += line;

            if (line == "Temp1:" || line.StartsWith("Version"))
            {
                label1.Text = ("line2");
                label2.Text = ("line3");
                label3.Text = ("line4");
                return;

            }