thread OnException event
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Applies to
acThread, acSQLQueryThread and acAppEvents components.  

property OnException: TNotifyEvent;  

The OnException event occurs if something has been failed on execution of thread, in the OnExecute event handler.  
Note that OnException event will NOT occurs if HandleExceptions property = False, that means that you would like to handle exceptions "manually" in OnExecute event handler.  
iiinfo The OnException method are already synchronized with the main application thread.  

See also
OnExecute and OnTerminate events;  
HandleExceptions property.