Introduction - If you have any usage issues, please Google them yourself
Unfortunately Microsoft has never paid much attention to the serial port. In the Windows API it is just regarded as a file, and in the first version (1.1) of the .NET framework (managed code) there was no support for serial communication. Fortunately, a new namespace - System.IO.Ports - has been added in version 2.0, which has made things much easier although there are still some problems. For example, it is not possible to control the FIFO in the UART. It is also not possible to tell when the transmitter serial register is empty, so it is almost impossible to control the modem control signals and send a break condition, but worst of all, Microsoft has put an 8 bit wide buffer on top of the 11-bit receiver FIFO and therefore destroyed the possibility for a precise Break, 9th bit and error detection. Besides, many of the examples in the help files are directly misleading and unnecessary complicated.