C#程序C#串口接收程序

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 Form3 : Form
    {
        byte[] urt0_received=new byte[100];
        byte[] manined_data = new byte[100];
        Int16 count;
        
        public Form3()
        {
            InitializeComponent();
            this.printDocument1.PrintPage += new
           System.Drawing.Printing.PrintPageEventHandler
           (this.document_PrintPage);
            this.docToPrint.PrintPage += new System.Drawing.Printing.PrintPageEventHandler(printDocument1_PrintPage);

        } 
        SerialPort  serialPort1=new SerialPort();
       // SerialPort  serialPort2 = new SerialPort("COM2",9600); 
        private void button2_Click(object sender, EventArgs e)

        {

            //var t1 = new Thread(G_data);
            //t1.Start(); 
            Thread t1 = new Thread(mycom_DataReceived);
            if (button2.Text == "打开")
            {
                serialPort3.Open();
                button2.Text = "关闭";
                t1.Start(); 
               // timer1.Enabled = true;
         
            }
            else
            {
                button2.Text = "打开";
                //timer1.Enabled =false ;   
                serialPort3.Close();
            }
           
        }

        //

        private void button1_Click(object sender, EventArgs e)
        {
            serialPort1.PortName = "COM5";
            serialPort1.BaudRate = 9600;
            serialPort1.Open();
           // Byte[] BSendTemp = new Byte[1]; //建立临时字节数组对象