private void DataReceivedHandler(object sender, SerialDataReceivedEventArgs e)
{
    byte data;
    int i = 0;
    int idx = 0;

     BeginInvoke((MethodInvoker)delegate
     {
          while (serial_port.BytesToRead > 0)
          {
                data = (byte)serial_port.ReadByte();

                RichTextBoxReceive.AppendText(data.ToString("X") + " ");
                idx++;

                if (i < RX_BUF_SIZE)
                    uart_rx_buf[i++] = data;
            }
                RichTextBoxReceive.AppendText("\n");
      });

      MessageReceivedEventArgs args = new MessageReceivedEventArgs();
      args.lenth = i;
     args.data = uart_rx_buf;
     OnMessageReceived(args);
}

 private void Form1_MessageReceived(object sender, MessageReceivedEventArgs e)
{
    BeginInvoke((MethodInvoker)delegate
    {
          ParseData(e.data, e.lenth);
          PrintData();
    });
}