Hi there use
C# dot net for coding<
pre lang="c#">
private SerialPort RFID;
RFID = new SerialPort();
RFID.PortName = "COM1";
RFID.BaudRate = 9600;
RFID.DataBits = 8;
RFID.Parity = Parity.None;
RFID.StopBits = StopBits.One;
RFID.Open();
RFID.DataReceived += new SerialDataReceivedEventHandler(RFID_DataReceived);
private void RFID_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
string data = RFID.ReadExisting();
myTextBox.Text += data;
}</pre>