http://msmvps.com/blogs/coad/archive/2005/03/23/SerialPort-_2800_RS_2D00_232-Serial-COM-Port_2900_-in-C_2300_-.NET.aspx
The above sample code is one of the best tutorial I have ever find discussing serial port programming using .Net. I recently been asked to download data from device through serial port.
To start with, I used the demo example to send simple command to the device and see whether the response is what I expected. Then I start working on my own application. Enjoy.
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