I need to Determine the serial port name connected to other machine using c#.
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I need to Determine the serial port name connected to other machine using c#.
This is just not the way serial ports work. It is not a bus, like USB or PCI, where you can plug something in and the operating system will do the ah-ha, new hardware! discovery automatically. Serial ports are very primitive, dating from the stone age of computer hardware.
It takes a human to plug a serial port device connector. With some luck, the connector will have a label which says what COM port number is assigned to the connector. Although that luck is hard to come by these days. She’ll then tell a program to establish a connection on that particular COM port. Hyperterminal is the canonical implementation of such a program on Windows.
You cannot realistically open every COM port that might be available. That prevents another program from using another COM port. You’ll prevent a modem from getting used for example. Part of the stone age legacy is that only one program can open a COM port, every other program will be locked out.
So, provide your program with a UI that lets the user select the COM port(s). Save the selection in your config data, it is very likely that the device is still connected to the same port when it starts back up. You can use WMI and the Win32_SerialPort class to provide a better description for the COM port (more than just the number). Some USB serial port emulators may set the Description property to something recognizable.
SerialPort.GetPortNames() enumerates the available COM port numbers. A basic sanity test is to check the SerialPort.DsrHolding property, it should be true when the serial port device is plugged in and powered-up.