In this tutorial make a simple Serial Port program using Visual C#
Type of module I’ll be using:
http://www.dealextreme.com/p/usb-to-uart-5-pin-cp2102-module-serial-converter-81872?item=8

Drivers: http://www.extremeelectronics.co.in/downloads/CP2102/CP210x_VCP_Win_XP_S2K3_Vista_7.exe