DeviceInterfaceGUIDs using ManagementEventWatcher

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Hello,
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Im writing USB listener using ManagementEventWatcher
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I need to get DeviceInterfaceGUIDs of arriving/removed USB device
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Is it possible?
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Here is my code
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from http://social.msdn.microsoft.com/forums/en-US/wpf/thread/983dc1ee-6208-4036-903f-3fd5674a1efb/ MSDN
<pre class="prettyprint public Listener()
{
WqlEventQuery _q = new WqlEventQuery("__InstanceOperationEvent", "TargetInstance ISA Win32_USBControllerDevice ");

_q.WithinInterval = TimeSpan.FromSeconds(1);

ManagementEventWatcher _w = new ManagementEventWatcher(_q);

_w.EventArrived += new EventArrivedEventHandler(onEventArrived);

_w.Start();

}
void onEventArrived(object sender, EventArrivedEventArgs e)
{
ManagementBaseObject baseObject = (ManagementBaseObject)e.NewEvent;

if (baseObject.ClassPath.ClassName.Equals("__InstanceCreationEvent"))
Console.WriteLine("A drive was connected");
else if (baseObject.ClassPath.ClassName.Equals("__InstanceDeletionEvent"))
Console.WriteLine("A drive was removed");
}

//Find Device Guid

}
}[/code]
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Thanks in advance
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