Errors happen. But in production, error logs often provide little or no help in pinpointing the exact line of code in which the problem originates. You can't usually isolate the root cause by modifying code in a production environment because recreating the exact same environment is very difficult due to the large number of potential software and hardware configurations. This article provides some concrete steps you can take to get at the heart of the problems in your production code.
MSDN Magazine July 2005
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