Getting a class to update a progress bar in the caller form

Suppose my form calls a class that does a lot of work.  The class could take 5 minutes to complete the job it is doing.  So every 20 seconds, perhaps, I would like the class to tell the form what percentage of the job is has completed, so that
I can update a progress bar.  Can this be done without my having to code a save of the state of the operation (going on in the class) and returning to the caller so that it can update the bar, restore the state and start things up again?
Thanks.

Do you use a BackgroundWorker or a seperate thread for the job? If not, the UI is frozen anyway.
Have a look here:
BackgroundWorker Class
Armin

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