Monitoring Threads

I am still working on that dll that runs a process in a different thread,
then raises a NewData event for the calling executable.  I have redone it
using the BackgroundWorker class to do my threading.  I have a
System.Timers.Timer object that runs the RunWorkerAsync method.  In the
RunWorkerCompleted event I raise the NewData event.  But the executable
still raises the cross-threading error when I try to update the form
controls.  Is there a way to programmatically get the thread ID that is
displayed on the Threads debug window?  I would like to log what thread is
active with each operation until I can find where my problem is.

Thanks,
Kelly