You can enable ASP.NET tracing either at an Application level or at a page level; see Tip# 77: Did you know… How to enable Page Level Tracing for your ASP.NET pages? for more information. With the tracing enabled, you can view the trace output in a trace
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Read the complete post at http://blogs.iis.net/webdevelopertips/archive/2009/12/18/tip-100-did-you-know-how-to-view-asp-net-trace-information.aspx