Hi greetings,
If you are looking for .Net programmer who experiences about serial data communication then I am the right freelancer you can hire.
You can check at my portfolio in my profile, there are 2 applications that have complex communication using RS232.
Below is just random keyword about RS232 and serial port communicarion to ensure you that I am expert for this :
barcode scanner, usb serial, invoke, crossthreadilegal, vbcr, vbcrlf, "\n\0\", chr(13), delay(100), rfid, readline, readexisting, readto(vbcrlf), baudrate, even, parity, dts, rts.
Please don't hesitate to contact me to tell about your requirement.
Thank You