C# Received data from Arduino

Thank you very much, but unfortunately it did not work :( The application connects to the serialport but nothing happens. The connection to the Arduino program Putty works.

namespace WindowsFormsApplication1
{

 public partial class Form1 : Form
{
    string InputData = String.Empty;
    delegate void SetTextCallback(string text);


    public Form1()
    {
        InitializeComponent();
        string[] ports = SerialPort.GetPortNames();


        Console.WriteLine("The following serial ports were found:");

        // Display each port name to the console.
        foreach (string port in ports)
        {
            comboBox1.Items.Add(port);
        }
    ;}



      public void guzikpolacz_Click(object sender, EventArgs e)
    {
        serialPort1.PortName = comboBox1.Text;         // Ustawiamy numer Portu COM
                // Ustawiamy wartość baudrate portu            

        //Inne ustawienia zdefiniowane na stałe
        serialPort1.Parity = Parity.None;   // bez parzystości
        serialPort1.StopBits = StopBits.One;  // jeden bit stopu
        serialPort1.DataBits = 8;    // osiem bitów danych   



        serialPort1.Open();

        polestatusu.Text = "Port Otwarty";

        panel1.BackColor = Color.Lime;
        guzikpolacz.Enabled = false;          //blokujemy przycisk Połącz
        guzikrozlacz.Enabled = true;   
}

    private void guzikrozlacz_Click(object sender, EventArgs e)
    {
        serialPort1.Close();             //Zamykamy SerialPort

        panel1.BackColor = Color.Red;
        polestatusu.Text = "Port Zamknięty";
        guzikpolacz.Enabled = true;   //aktywujemy przycisk Połącz
        guzikrozlacz.Enabled = false;  // deaktywujemy przycisk Rozłącz
    }

    private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
    {
        if (this.InvokeRequired)
        {
            this.Invoke(new Action(() => serialPort1_DataReceived(sender, e)));
        }
        else
        {
            var sp = sender as SerialPort;
            //this assumes you want the data from the arduino as text.  
            // you may need to decode it here.
            textBox1.Text = sp.ReadExisting();
        }
    }



 private delegate void UpdateUiTextDelegate(string text);



 public Delegate myDelegate { get; set; }
    }
}

enter image description here

try adding this event handler to your serial port

private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
    if (this.InvokeRequired)
    {
        this.Invoke(new Action(() => serialPort1_DataReceived(sender, e)));
    }
    else
    {
        var sp = sender as SerialPort;
        //this assumes you want the data from the arduino as text.  
        // you may need to decode it here.
        polestatusu.Text = sp.ReadExisting();
    }
}