I have a .Net/c# 2.0 windows service. The entry point is wrapped in a try catch block yet when I look at the server's application event log I seem a number of "EventType clr20r3" errors that are causing the service to die unexpectedly. The catch block has a "catch (Exception ex)".

Each sql commands is of the type "CommandType.StoredProcedure" and are executed with SqlDataReader's. These sproc calls function correctly 99% of time and have all been thoroughly unit tested, profiled, and QA'd. I additionally wrapped these calls in try catch blocks just to be sure and am still experiencing these unhandled exceptions.

This only in our production environment and cannot be duplicated in our dev or staging environments (even under heavy load).

Why would my error handling not catch this particular error? Is there anyway to capture more detail as to the root cause of the problem?

Here is an example of the event log:

EventType clr20r3, P1 RDC.OrderProcessorService, 
P2 1.0.0.0, 
P3 4ae6a0d0, 
P4 system.data, 
P5 2.0.0.0, P6 4889deaf, 
P7 2490, 
P8 2c, 
P9 system.data.sqlclient.sql, 
P10 NIL.

Additionally

The Order Processor service terminated unexpectedly.  
It has done this 1 time(s).  
The following corrective action will be taken in 60000 milliseconds: 
Restart the service.