C# SerialPort#Open() method throws ArgumentException because of port name?

Question

On my local machine,

• Windows XP
• Ports (COM & LPT)
  • COM3
  • RIM Virtual Serial Port v2 (COM4)
  • RIM Virtual Serial Port v2 (C

Answer 1

have a look at http://social.msdn.microsoft.com/Forums/en/csharpgeneral/thread/35954173-2eeb-46af-bb3e-86840c6b5484

seems the problem was that those COM ports were mapped to something else and gives this strange error in response.

I had exactly the same problem. I found that I had a windows printer setup to use the same port. As soon as I changed the port in the printers settings, the SerialPort.Open() worked.