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ASPNET offers several tools for diagnosing problems in your applications Tracing provides a welcome alternative to printing diagnostic messages to your pages using ResponseWrite, which ASP developers have always relied on heavily Application-level tracing is useful for tracking down problems that occur across multiple pages in an application And more than 50 new performance monitor counters provide detailed diagnostic information about ASPNET's behavior on your server
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511 Page Tracing
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Table of Contents One of the most useful, and easiest-to-use, diagnostic features of ASPNET is page tracing Simply adding
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Trace=true ASPNET directive causes ASPNET to Essential to your @Pagewith Examples in C# generate diagnostic information at the end of your
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normal page ByFritz Onion rendering, containing everything you would ever want to know about the request and its response Page-level tracing is extremely convenient because just by placing one additional attribute on your aspx page, you can quickly collect information about the any request made to that page Figure 5-1 Publisher : Addison Wesley shows an example of a page that has enabled tracing and the resulting output generated when that page is Pub Date : February 11, 2003 rendered
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ISBN : 0-201-76040-1 : 432 Pages
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Figure 5-1 Enabling Trace on a Page
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"This well-conceived and well-written book has extensive knowledge and priceless experience overflowing from its pages It captures the true essence of ASPNET and walks the reader to a high level of technical and architectural skill"-J Fred Maples, Director of Software Engineering, NASDAQcom Essential ASPNET with Examples in C# is the C# programmer's definitive reference for ASPNET through version 11 It provides experienced programmers with the information needed to fully understand the technology, and is a clear guide to using ASPNET to build robust and well architected Web applications This book begins with a discussion of the rationale behind the design of ASPNET and an introduction to how it builds on top of the NET framework Subsequent chapters explore the host of new features in ASPNET, including the server-side compilation model, code-behind classes, server-side controls, form validation, the data binding model, and custom control development Throughout the book, working examples illustrate best practices for building Web-based applications in C# Among the topics explored in depth are:
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Enabling page tracing displays six pieces of information for a page, as listed in Table 5-1 The request Web forms details section shows the session ID, the time of the request, the encoding types of the request and response, and the resulting status code The trace information section contains the output of trace Configuration statements made either by system libraries or by the page The control tree section displays all the controls that were created to render the page along with how many rendering bytes they occupied and how much HTTP pipeline information they stored in the view state cache The cookies collection shows the names and values of all cookies sent by a and error handling collection shows all the header information presented by the client at Diagnostics client The headers the time of the request Finally, the server variables section shows all the intrinsic server variables available Validation to page scripts, and their values
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Data binding Custom controls
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Table 5-1 Contents of Page Trace Information
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Caching State management
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Section [ Team LiB ] Request details Trace information Control tree Cookies collection Headers collection Server variables
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Description Details of the request, including the session ID, the time the request was made, the request and response encodings, the request type, and the return status code Output of any TraceWrite or TraceWarn statements Hierarchical display of all server-side controls in the requested page All cookies accompanying the request All headers accompanying the request All the server variables and their values at the time of the request
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Table of Contents 512 Writing Trace Messages
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ByFritz Onionenabling tracing on a page is to be able to see at a glance all the relevant data associated with a The goal of
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particular request, to easily diagnose any problems that might have occurred Many of the methods in ASPNET : Addison Wesley Publisher classes generate some output to the trace stream, as you will see if you enable tracing on a page In addition : February 11, 2003 to the ASPNET-generated output, however, it is often even more useful to have custom output Pub Date
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