| http://www.w3.org/ns/prov#value | - If you are in a WinForms environment, you usually will do something with this data in the UI. Of course, your callback is executing on the background worker so if you do not marshall the data to the UI thread, then you get a lovely InvalidOperationException Cross-thread operation not valid: Control 'blahblahblah' accessed from a thread other than the thread it was created on.
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