How to receive data via serial communication in C#

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C#3.0

C#

i am trying to read the sd card data which is connected to renesas microcintroller. microcontroller is serially connected with FT232RL module. i am using c# apps to read the data but the data is not received in application.
i need help!

What I have tried:

//connect button
 private void Button1_Click(object sender, EventArgs e)
        {
            
           

            if (ftStatus == FTDI.FT_STATUS.FT_OK)
            {
               
                commentbox.Text = "Number of FTDI devices: " + ftdiDeviceCount;
            }
            else
            {
                // Wait for a key press
               
                commentbox.Text = "Failed to get number of devices error " + ftStatus;
                return;
            }

            if (ftdiDeviceCount == 0)
            {
                // Wait for a key press
              
                commentbox.Text = "Failed to get number of devices error " + ftStatus;
                return;
            }
            FTDI.FT_DEVICE_INFO_NODE[] ftdiDeviceList = new FTDI.FT_DEVICE_INFO_NODE[ftdiDeviceCount];

            // Populate our device list
            ftStatus = myFtdiDevice.GetDeviceList(ftdiDeviceList);

            if (ftStatus == FTDI.FT_STATUS.FT_OK)
            {
                for (UInt32 i = 0; i < ftdiDeviceCount; i++)
                {

                    richTextBox1.Text = "Device Index: " + i.ToString() + "\n" + "Flags: " + String.Format("{0:x}", ftdiDeviceList[i].Flags) + "\n" + "Type: "
                        + ftdiDeviceList[i].Type.ToString() + "\n" + "ID: " + String.Format("{0:x}", ftdiDeviceList[i].ID) + "\n" + "Location ID: " + String.Format("{0:x}", ftdiDeviceList[i].LocId) + "\n"
                        + "Serial Number: " + ftdiDeviceList[i].SerialNumber.ToString() + "\n" + "Description: " + ftdiDeviceList[i].Description.ToString() 
                       /* + "Serial Port: " + comstr*/;
                        

                }
            }
            ftStatus = myFtdiDevice.OpenBySerialNumber(ftdiDeviceList[0].SerialNumber);
            if (ftStatus != FTDI.FT_STATUS.FT_OK)
            {
                // Wait for a key press
                //Console.WriteLine("Failed to open device (error " + ftStatus.ToString() + ")");
                //Console.ReadKey();
                commentbox.Text = "Failed to open device error " + ftStatus;

                return;
            }
         
            myFtdiDevice.GetCOMPort(out comstr);
            //listBox3.Items.Add("Com Port: " + comstr);
           // ftStatus = myFtdiDevice.Close();
            comboBox1.Text =  comstr;
         
            // Set up device data parameters
            // Set Baud rate to 9600
            ftStatus = myFtdiDevice.SetBaudRate(9600);
            if (ftStatus != FTDI.FT_STATUS.FT_OK)
            {

                commentbox.Text = "Failed to set Baud rate error " + ftStatus;

                return;
            }

            // Set data characteristics - Data bits, Stop bits, Parity
            ftStatus = myFtdiDevice.SetDataCharacteristics(FTDI.FT_DATA_BITS.FT_BITS_8, FTDI.FT_STOP_BITS.FT_STOP_BITS_1, FTDI.FT_PARITY.FT_PARITY_NONE);
            if (ftStatus != FTDI.FT_STATUS.FT_OK)
            {

                commentbox.Text = "Failed to set data characteristics error " + ftStatus;

                return;
            }

            // Set flow control - set RTS/CTS flow control
            ftStatus = myFtdiDevice.SetFlowControl(FTDI.FT_FLOW_CONTROL.FT_FLOW_RTS_CTS, 0x11, 0x13);
            if (ftStatus != FTDI.FT_STATUS.FT_OK)
            {

                commentbox.Text = "Failed to set flow control error " + ftStatus;

                return;
            }

            // Set read timeout to 5 seconds, write timeout to infinite
            ftStatus = myFtdiDevice.SetTimeouts(5000, 0);
            if (ftStatus != FTDI.FT_STATUS.FT_OK)
            {

                commentbox.Text = "Failed to set timeouts error " + ftStatus;

                return;
            }
           

        }
<pre>  private void ReadData_Click(object sender, EventArgs e)
        {
           UInt32 numBytesAvailable = 0;
            do
            {
                ftStatus = myFtdiDevice.GetRxBytesAvailable(ref numBytesAvailable);
                if (ftStatus != FTDI.FT_STATUS.FT_OK)
                {
                    // Wait for a key press

                    commentbox.Text = "Failed to get number of bytes available to read error " + ftStatus.ToString();
                    return;
                }
                Thread.Sleep(10);

            }
            while (numBytesAvailable <= 0);

            {
                // Now that we have the amount of data we want available, read it
                string readData = "";

                UInt32 numBytesRead = 0;
                if (readData == "")
                {
                    ftStatus = myFtdiDevice.Read(out readData, numBytesAvailable, ref numBytesRead);
                    richTextBox1.Text = readData;

                }
                // Note that the Read method is overloaded, so can read string or byte array data
                //  ftStatus = myFtdiDevice.Read(out readData, numBytesAvailable, ref numBytesRead);
                if (ftStatus != FTDI.FT_STATUS.FT_OK)
                {
                    // Wait for a key press
                    //Console.WriteLine("Failed to read data (error " + ftStatus.ToString() + ")");
                    //Console.ReadKey();
                    commentbox.Text = "Failed to read data error " + ftStatus.ToString();
                    return;
                }
                // Console.WriteLine(readData);
                commentbox.Text = readData;
                // Close our device
                ftStatus = myFtdiDevice.Close();

                // Wait for a key press

                Console.WriteLine("Press any key to continue.");
                Console.ReadKey();
                return;
            }
        }