Beginning ASP.NET 3.5 in C# 2008: From Novice to Professional, Second Edition

8.7. Page Tracing

ASP.NET's detailed error pages are extremely helpful when you're testing and perfecting an application. However, sometimes you need more information to verify that your application is performing properly or to track down logic errors, which may produce invalid data but no obvious exceptions.

You could try to catch these errors by recording diagnostic information in an event log, but this assumes that someone will actually review the log regularly. More aggressively, you could display some information directly in the web page. The problem with this strategy is that you need to remove (or at least comment out) all this extra code before you deploy your web application. Otherwise, your website users could see strange debugging ...