c# 串口通信事件触发

请教各位大侠：
    采集上来的值在给this.textBox2.Text和this.textBox1.Text赋值时，该this.textBox1.Text的值确在this.textBox2.Text中或this.textBox2.Text的值确在this.textBox1.Text中，相互混淆，如何修改下面的代码。谢谢！
 public Thread EDA17_M = null；
 EDA9017_M = new Thread(new ThreadStart(EDA17_M_tx))；
  EDA9017_M.Start();  private void EDA17_M_tx()
        {         
            Monitor.Enter(this);
                if (E9060_K1KZ == 1)
                {
                    Tx_ML = EDA17_Cd1;
                    EDA17_M1_Cj();
                   
                }                else if (E9060_K1KZ == 2)
                {
                    Tx_ML = EDA17_Cd2;
                    EDA17_M1_Cj();
                   
                }
                else if (E9060_K1KZ == 3)
                {
                  
                    K1_Xweijanniu();
                   
                }
                else if (E9060_K1KZ == 4)
                {                    K2_Xweijanniu();                }
                else if (E9060_K1KZ == 5)
                {                    K3_Xweijanniu();                }
                else if (E9060_K1KZ == 6)
                {                    G1_Xweijanniu();                }
                else if (E9060_K1KZ == 7)
                {                    G2_Xweijanniu();                }
                else if (E9060_K1KZ == 8)
                {                    G3_Xweijanniu();                }
                else if (E9060_K1KZ == 9)
                {                    for (int i = 0; i < 4; i++)
                    {
                        switch (i)
                        {
                            case 1:
                                G1_Xweijanniu();                                break;
                            case 2:
                                G2_Xweijanniu();                                break;
                            case 3:
                                G3_Xweijanniu();                                break;                        }
                    }
                }                Monitor.Exit(this); //break;  
                Thread.Sleep(5);
        }
     {  private void EDA9017_M1_Cj()//通道1
        {            if (!isSetProperty)
            {                setportProperty();
                isSetProperty = true;
            }
            else
            {
                serialPort1.ReceivedBytesThreshold = 1;
              
                serialPort1.ErrorReceived += new SerialErrorReceivedEventHandler(_seriaPort_ErrorReceived);
            }
            if (serialPort1.IsOpen)
            {
            
                try
                {
                    ReceiveEventFlag = true;
                    serialPort1.DiscardOutBuffer();
                    serialPort1.DiscardInBuffer();
                   
                    serialPort1.Write(Tx_ML, 0, Tx_ML.Length);
                      ReceiveEventFlag = false;
                     System.Threading.Thread.Sleep(100);                    
                }                catch (Exception)
                {                    MessageBox.Show("采集失败！");                    return;
                }            }        }
 private void comm1_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            if (ReceiveEventFlag) return;   //禁止接收事件时直接退出
            try
            {
                Listening = true;//设置标记，说明我已经开始处理数据，一会儿要使用系统UI的。 
                int n = serialPort1.BytesToRead;//先记录下来，避免某种原因，人为的原因，操作几次之间时间长，缓存不一致   
                byte[] buff1 = new byte[9];           
                serialPort1.Read(buff1, 0, n);          
                System.Threading.Thread.Sleep(100);             
                EDA17_Mg1_Llimit = Convert.ToUInt32((Scoft.Bclas.ClasCRC.ByteToString(buff1)).Substring(6, 4), 16);
                this.Invoke((EventHandler)
                    (delegate
                    {
                        if (E9060_K1KZ == 1)
                        {
                            this.textBox1.Text=
Convert.ToString(Scoft.Bclas.ClasCRC.GetSiSheWuRuNumber(Bclas.ClasCRC.L_ineartn(EDA17_Rge1_Ulimit, EDA17_Rge1_Llimit, EDA17_Nf1_Ulimit, EDA17_Nf1_Llimit, EDA17_Mg1_Llimit), 2));                            E9060_K1KZ = 2;
                                                 }
                        else if (E9060_K1KZ == 2)
                        {
                       this.textBox2.Text = Convert.ToString(Scoft.Bclas.ClasCRC.GetSiSheWuRuNumber(Bclas.ClasCRC.L_ineartn(EDA17_Rge1_Ulimit, EDA17_Rge1_Llimit, EDA17_Nf1_Ulimit, EDA17_Nf1_Llimit, EDA17_Mg1_Llimit), 2));
                            E9060_K1KZ = 1;//Bclas.ClasCRC.L_ineartn（）线性处理，Scoft.Bclas.ClasCRC.GetSiSheWuRuNumber（）四舍五入
                          
                        }
                       
                    }));                serialPort1.DiscardInBuffer();
                ReceiveEventFlag = true;
            }
            finally
            {
                  Listening = false;             
                timer2.Start();
            }        }
     private void timer2_Tick(object sender, EventArgs e)
        {            timer2.Stop();
            EDA17_M_tx();
           
        }