Visual servo

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

namespace Servo
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }



        private void Form1_Load(object sender, EventArgs e)
        {
            try
            {
                Porta.Open();
            }
            catch
            {
                MessageBox.Show("Cabo desconectado", "Erro");
                Close();
            }
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            try
            {
                if (Porta.IsOpen)
                {
                    Porta.Close();
                }
            }
            catch
            { }
        }

        private void Porta_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
        {
            BeginInvoke(new Action(() =>
            {
                try
                {

                    textBox1.Text = Porta.ReadLine();



                }
                catch { }
            }));
        }





        private void button1_Click_1(object sender, EventArgs e)
        {

                 Porta.Write('0'+textBox2.Text + "\n\r");


        }
    }
}