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I am investigating some crashes in my application caused by a Win32 exception, and I have narrowed it down that it must be occurring in the threadpool which is taking care of the EventLog.EntryWrittenEventHandler event handler in my application. I set this up like this: // Create the event log monitor eventLog.Log = "Application"; eventLog.EnableRaisingEvents = true; eventLog.EntryWritten += new EntryWrittenEventHandler(EventLogMonitor); EventLogMonitor is the handler for my event. I am wondering does anybody have any ideas as to where I could find out whats causing this exception. It seems that to listen for events a ThreadPoolWaitOrTimerCallback is being set up, which wouldn't have any of my code on it, and if the exception is occurring on this I just cant see how to deal with this problem. Any help is really appreciated!! Here is the output of !clrstack in WinDBG: 0:008> !clrstack OS Thread Id: 0x106c (8) ESP EIP 049df1c8 7756f871 [HelperMethodFrame: 049df1c8] 049df26c 73ce6fa0 System.Diagnostics.EventLog.get_OldestEntryNumber() 049df27c 73bf24ed System.Diagnostics.EventLog.CompletionCallback(System.Object) 049df2c4 73bf0fe4 System.Diagnostics.EventLog.StaticCompletionCallback(System.Object, Boolean) 049df2f4 744fc3b8 System.Threading._ThreadPoolWaitOrTimerCallback.WaitOrTimerCallback_Context(System.Object, Boolean) 049df300 744fc373 System.Threading._ThreadPoolWaitOrTimerCallback.WaitOrTimerCallback_Context_f(System.Object) 049df304 7400027f System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object) 049df31c 744fc477 System.Threading._ThreadPoolWaitOrTimerCallback.PerformWaitOrTimerCallback(System.Object, Boolean) 049df4ac 74991b5c [GCFrame: 049df4ac] In case it helps, my application is just checking the event ID of every entry written to the event log, and if it match

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