Data Receie Loop in Serial Port C#,WPF

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C#

WPF

SerialPort sp;

 Public string[] portnames=SerialPort.GetPortNames();
        private void Window_Loaded(object sender, RoutedEventArgs e)
        {           
           foreach (string s in portnames)
            {
                comport.ItemsSource = OrderedPortNames();
            }
        }

        private void Read_Click(object sender, RoutedEventArgs e)
        {

sp = new System.IO.Ports.SerialPort(comport.Text, Convert.ToInt32(baud.Text), Parity.None, Convert.ToInt32(bitrat.Text), StopBits.One);
 sp.DataReceived += new SerialDataReceivedEventHandler(receive_data);           
   
     private void receive_data (object sender, SerialDataReceivedEventArgs e)
        {
           string data = sp.ReadExisting();
            MyLog(data);   
        }
      
       private void MyLog(string msg)
        {
            this.Dispatcher.Invoke(new DisplayTextDelegate(DisplayText), data);          
        }

        private void DisplayText(string text)
        {            
            textBox1.AppendText(text);
        }

        private void write_Click(object sender, RoutedEventArgs e)
        {
            sp.Write(textBox2.Text);
            textBox2.Text = "";
        }

        private void button2_Click(object sender, RoutedEventArgs e)
        {
            if (sp.IsOpen)
                sp.Close();   
        }

This is a small Chat program i wrote for Serialport Data Receive and Send,my question is if we send data from one COM Port to other ,other COMport should read continuously ,for example if i send 'HELLO' ,in other COM Port read 'HELLO' continuous un limited,giving one checkbox to stop loop, using Threading can any one help please, i used TextBoxes for sending and receiving data .