I'm getting the following message on a big operation that I'm running:
The CLR has been unable to transition from COM context 0x1fe458 to COM context 0x1fe5c8 for 60 seconds. The thread that owns the destination context/apartment is most likely either doing a non pumping wait or processing a very long running operation without pumping Windows messages. This situation generally has a negative performance impact and may even lead to the application becoming non responsive or memory usage accumulating continually over time. To avoid this problem, all single threaded apartment (STA) threads should use pumping wait primitives (such as CoWaitForMultipleHandles) and routinely pump messages during long running operations.
How do I send windows messages so that this error will no longer occur on long operations?
It's unclear exactly what the context is - are you performing some long-running task on the UI thread of a WinForms or WPF app? If so, don't do that - use BackgroundWorker, or run the task on the thread pool or a new thread directly (possibly using Control.Invoke/BeginInvoke or Dispatcher if you need to update the UI). If your big operation uses the COM component which is complaining, it'll be harder...