Task: Serial Communication through different ports

Hi,
I need to communicate through RS232 and RS485. I need to send data from RS485 and recieve same data from RS232. IC will do transmit data from RS485 to RS232. For this I wrote some sample code but I am not able to get recieved data in to textbox.I created RS232 and RS485 serial ports from components section of toolbox.
Settings for Ports: Baudrate: 57600 DataBits:8 Parity: Even
Any advice on this?

My code:

 public partial class Form1 : Form
    {
        private delegate void SetTextDeleg(string text);
        string strData;       
        string RXString;
        string data;
        public Form1()
        {
            InitializeComponent();
            Transmit.Text = "";            
            Recieve.Text = "";
            
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            RS485.DataReceived += new SerialDataReceivedEventHandler(RS485_DataReceived);
        }

        private void RS485_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            try
            {
                Thread.Sleep(500);
                data = RS485.ReadLine();
                this.Invoke(new EventHandler(DisplayText));               

            }
            catch (System.TimeoutException ex)
            {
                MessageBox.Show(ex.ToString());
            }

        }

        private void DisplayText(object sender, EventArgs e)
        {
            Recieve.Enabled = true;
            //Recieve.Text = data;
            Recieve.AppendText(data);
          
        }

        private void btnStart_Click(object sender, EventArgs e)
        {
            if (Transmit.Text != "")
            {
                ModbusTest();
            }
            else
            {
                MessageBox.Show("Enter data to be transmitted");
            }
           
        }

        public void ModbusTest()
        {
            try
            {
                if (!RS232.IsOpen && !RS485.IsOpen)
                {
                   
                    RS232.Open();
                    RS485.Open();
                    RS485.DataReceived += new SerialDataReceivedEventHandler(RS485_DataReceived);
                }
                else
                {
                    MessageBox.Show("Unable to open the operts");
                }
            }
            catch (UnauthorizedAccessException ex)
            {
                MessageBox.Show(ex.Message);
            }

            
            try
            {
                
                if (RS232.IsOpen && RS485.IsOpen)
                {
                    strData = Transmit.Text;
                    RS232.WriteLine(strData);                    
                    RS485.DataReceived += new SerialDataReceivedEventHandler(RS485_DataReceived);
                    RXString = RS485.ReadExisting();
                    Transmit.Enabled = false;
                    //txtRecieve.Text = data;                 
                }

            }

            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void Form_Closing(object sender, FormClosingEventArgs e)
        {
            RS232.Close();
            RS485.Close();
        }
               
    }