c#串口通信，如何让接受到的数据显示在textbox中

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;

using System.IO.Ports;



namespace 串口收发

{

    public partial class Form1 : Form

    {

        public string receiveing = string.Empty;

        public string transmission = string.Empty;



        public Form1()

        {

            InitializeComponent();

        }

        

        private void button1_Click(object sender, EventArgs e)

        {

            

            transmission = txtTransmission.Text;

            serialPort1.WriteLine(transmission);

            MessageBox.Show("数据发送成功！", "系统提示");

        }



        private void serialPort2_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)

        {

            receiveing = serialPort2.ReadLine();

        }



        private void button2_Click(object sender, EventArgs e)

        {

            

            txtReceive.Text = receiveing;

            MessageBox.Show("数据接收成功！", "系统提示");

        }



        private void Form1_Load(object sender, EventArgs e)

        {

            serialPort1.Open();

            serialPort2.Open();

        }

    }

}

------解决方案--------------------
用代码设置一下波特率试试，我用物理设备接到电脑上，发现得用代码来设置波特率才行，如果直接从属性选项那里去设置，会出现莫名其妙的问题，导致接收不到数据
------解决方案--------------------

using Sy