Com1-Port steuern mit C#

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


namespace WindowsFormsApplication1
{
    
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            if (serialPort1.IsOpen == false)
            {
                serialPort1.Open();
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            label1.Text = "ON";
            serialPort1.DtrEnable = true;
            serialPort1.RtsEnable = true;
        }

        private void button2_Click(object sender, EventArgs e)
        {
            label1.Text = "OFF";
            serialPort1.DtrEnable = false;
            serialPort1.RtsEnable = false;
        }
    }
}

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


namespace WindowsFormsApplication1
{

    public partial class Form1 : Form
    {
        int x;
        int y;

        public Form1()
        {
            
            InitializeComponent();
            
            if (serialPort1.IsOpen == false)
            {
                serialPort1.Open();
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            label1.Text = "ON";
            serialPort1.DtrEnable = true;
            button1.Enabled = false;
            button2.Enabled = true;
            
        }

        private void button2_Click(object sender, EventArgs e)
        {
            label1.Text = "OFF";
            serialPort1.DtrEnable = false;
            button1.Enabled = true;
            button2.Enabled = false;
        }

        private void button3_Click(object sender, EventArgs e)
        {
            label4.Text = "ON";
            serialPort1.RtsEnable = true;
            button4.Enabled = true;
            button3.Enabled = false;
        }

        private void button4_Click(object sender, EventArgs e)
        {
            label4.Text = "OFF";
            serialPort1.RtsEnable = false;
            button4.Enabled = false;
            button3.Enabled = true;
        }


        private void button5_Click(object sender, EventArgs e)
        {
            progressBar1.Value = 1;
            backgroundWorker1.RunWorkerAsync();
            button5.Enabled = false;
        }
       
        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            x = 0;
            y = 200;
            while (x < 1)
            {
                System.Threading.Thread.Sleep(y);
                serialPort1.Write(new byte[] { 70,1,1,1,1,1,2,3,4,5,6,7,8,9,10,1,2,3,4,5,6,7,8,9,1,0 }, 0, 26);
            }
        }

        private void button8_Click(object sender, EventArgs e)
        {
            progressBar1.Value = 0;
            x = 1;
            button5.Enabled = true;
        }

        private void trackBar1_Scroll(object sender, EventArgs e)
        {
            y = 30 - (trackBar1.Value);
            int s;
            s = Convert.ToInt16(30-(trackBar1.Value));
            label5.Text = s.ToString();
            progressBar1.Value = (5+5*trackBar1.Value);
        }

 
              
    }
}