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Application-level tracing, which you enable through your ASP.NET application’s configuration system, enables the ASP.NET framework to collect information about HTTP requests for an entire application. Unlike page-level trace statements, this information is not displayed in a browser unless you so specify, but can be displayed in a Web-based trace viewer application. This viewer displays trace information for a series of requests to the application, so the metrics for each request must be stored in memory while tracing is enabled. You can do this by inserting a TraceContext class that participates in the HTTP execution of each request to your application.

For more information on these subjects, see the following topics:

Enabling Application-level Tracing

Viewing Application-level Trace Information with the Trace Viewer

ASP.NET Trace Functionality