อยากรู้ว่ารับค่าจากSerial Portให้แสดง"123456"แล้วจะแยกให้แสดงคนล่ะtextboxได้หรือป่าวครับ

   public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        SerialPort port = new SerialPort();
        private void Form1_Load(object sender, EventArgs e)
        {
            try
            {
                #region Display all available COM Ports
                string[] ports = SerialPort.GetPortNames();
                // Add all port names to the combo box:
                foreach (string port in ports)
                {
                    //this.cboPortName.Items.Add(port);
                    this.cbbCOMPorts.Items.Add(port);
                }
                #endregion
                this.btnDisconnect.Enabled = false;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
        private void btnConnect_Click_1(object sender, EventArgs e)
        {
            if (port.IsOpen)
            {
                port.Close();
            }
            try
            {
                {
                    port.PortName = cbbCOMPorts.Text;
                    port.BaudRate = 96000;
                    port.Parity = Parity.None;
                    port.DataBits = 8;
                    port.StopBits = StopBits.One;
                }
                //.Encoding = System.Text.Encoding.Unicode 
                port.Open();
                lblMessage.Text = cbbCOMPorts.Text + " Connected. ";
                btnConnect.Enabled = false;
                btnDisconnect.Enabled = true;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            txtDataToSend.Focus();
        }
        private void btnDisconnect_Click_1(object sender, EventArgs e)
        {
            try
            {
                port.Close();
                lblMessage.Text = port.PortName + " disconnected.";
                btnConnect.Enabled = true;
                btnDisconnect.Enabled = false;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
        private void btnSend_Click(object sender, EventArgs e)
        {
            try
            {
                port.Write(txtDataToSend.Text);
                //txtDataReceived->IS a data Received Text Box name 
               //txtDataToSend->is a data send Text Box name

                txtDataReceived.AppendText (txtDataToSend.Text ); // <<---- error here
                txtDataReceived.Text = txtDataReceived.Text + txtDataToSend.Text;//<--- i Tried but it not error but data cannot be appendtext in text box(txtDataReceived)
                txtDataReceived.ScrollToCaret();
               }
               txtDataToSend.Text = string.Empty;
           }
           catch (Exception ex)
           {
               MessageBox.Show(ex.Message);
           }
 
       }