Checking COM Port Availability in C#

My C# application populates a comboBox with the COM ports found on the system. I would like the mark the COM ports that are in use as such. I know that I can 开发者_开发问答use try / catch blocks to attempt to open every COM port, but I was wondering if there is a more graceful way to do this. Perhaps using a WMI query? I am using Microsoft Visual C# 2008 Express Edition (.NET 2.0). Any thoughts or suggestions you may have would be appreciated. Thanks.

I'm not aware of any other method to do this. Attempting to open them is the way that native code does the same check.

I know this a Old. But there is now a really easy way to do this. You can check if a port is open with:

if (serialPort1.IsOpen)
{
    ("Port Open");
}