Dear Experts

I developed an application that sends SMS messages from a USB GSM modem. I'm using a third party dll. I need to pass in the COM PORT, that the modem appears to be connected to.

So far, I've been looking up the COM PORT manually using the Windows Device Manager, and write it into a properties file. I'm wondering if there's a way to detect which COM PORT, the modem is connected to programmatically?

It'll save the trouble of looking it up every time.
The port number changes if I unplug/replug it sometimes.

Please help