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Editorial Team
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Asked: 2026-05-27T10:25:58+00:00

When I run my application after some Seconds this exception occurred. What is this

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When I run my application after some Seconds this exception occurred. What is this exception and how can I handle it?

The CLR has been unable to transition from COM context 0x647f10 to COM
context 0x648080 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.

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1 Answer

  1. Editorial Team

    This typically occurs if you have something blocking your user interface thread, and are using COM components.

    The best approach here is to move your long running operation into a background thread. This leaves your UI responsive, which also means that the COM messages can pump correctly. BackgroundWorker is a nice tool for this.

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