Help me initial project C# GUI

[Wisit]

Hi all,
Help me initial project.
my arduino nano board has flash StandardFirmata (version 2.4.4) sketch
and my C# code shown here.

using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Solid.Arduino.Firmata;
using Solid.Arduino;

namespace arduino
{
public partial class Form1 : Form
{
ArduinoSession session = null;
SerialConnection connection = null;
IFirmataProtocol firmata = null;
public Form1()
{
InitializeComponent();
label1.Text = ".......";
}

    private void Form1_Load(object sender, EventArgs e)
    {
        connection = new SerialConnection("COM3", SerialBaudRate.Bps_57600);
        session = new ArduinoSession(connection,timeOut: 250);
        firmata = (IFirmataProtocol)session;
        if(session != null)
        {
            Firmware firm = firmata.GetFirmware();
            label1.Text = String.Format("Firmware: {0} {1}.{2}", firm.Name, firm.MajorVersion, firm.MinorVersion);
            BoardCapability board = firmata.GetBoardCapability();
            //firmata.ResetBoard();
            firmata.SetDigitalPinMode(13, PinMode.DigitalOutput);
            firmata.SetDigitalPin(13, false);
            //label1.Text = "Arduino session open";

        }
    }

    private void button1_Click(object sender, EventArgs e)
    {
        session.SetDigitalPin(13, true);
    }

    private void button2_Click(object sender, EventArgs e)
    {
        session.SetDigitalPin(13, false);
    }

    private void Form1_FormClosing(object sender, FormClosingEventArgs e)
    {
        connection.Close();
        session.Clear();

    }
}

}

but not working.

[7ASecond]

What is it doing and what do you expect it to do?