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you have built that displays information to users about the unhandled exception, which they could then relay to you If it is any other type of error, just let it pass through, and ASPNET will take care of redirecting Publisher : Addison Wesley users to the appropriate error page It is important to perform the ServerTransfer() to the error page Pub Date the February 11, 2003 to retain : exception information, because performing a ServerRedirect() cause a round-trip back to ISBN : 0-201-76040-1 the client, and the error information will be lost Listing 5-6 shows the technique for performing the test on Pages : 432 the exception and executing a transfer to the error page, and Listing 5-7 shows the sample error page that then has access to the exception information Note that the exception typically is passed through the InnerException field of the Exception class Listing 5-6 Retaining Exception Information "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
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Essential ASPNET with Examples in C# is the C# programmer's definitive reference for ASPNET through protected void Application_Error(Object sender, EventArgs e) { version 11 It provides experienced is HttpUnhandledException) needed to fully understand the if (ServerGetLastError() programmers with the information technology, and is a clear guide to using ASPNET to build robust and well architected Web applications ServerTransfer("MyErrorPageaspx"); This book begins with a discussion of the rationale behind the ASPNET ASPNET and an introduction to how // Otherwise, we fall through, and the normal design of it builds on top of the NET framework Subsequent chapters explore the host of new features in ASPNET, // error handling takes over 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#
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Listing 5-7 Accessing Exception Information in an Error Page Among the topics explored in depth are:
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<! MyErrorPageaspx > ASPNET architecture <%@ Page Language='C#' %> Web <html> forms <h1>My error page</h1> <% Configuration Exception ex = ServerGetLastError(); HTTP pipeline null) if (ex != { Diagnostics and error handling string err=""; if (exInnerException != null) Validation ResponseOutputWrite("The error was: {0}", exInnerExceptionMessage); Data binding } %> </html> controls Custom
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SUMMARY
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ASPNET provides a welcome set of new diagnostic tools to Web application development The shift from interpretation to compilation means that all the debugging facilities available for standard application development are now available for Web application development too Page and application tracing provide comprehensive diagnostic output for any page in an application, and generating custom trace messages is a great way to track problems in an application The installation of ASPNET also includes a number of performance monitor counters that track virtually every aspect of an application Finally, it is possible to specify custom error pages to display to users when things inadvertently go wrong
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Table of Contents
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ByFritz Onion Publisher Pub Date ISBN Pages : Addison Wesley : February 11, 2003 : 0-201-76040-1 : 432
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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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ASPNET architecture Web forms Configuration HTTP pipeline Diagnostics and error handling Validation Data binding Custom controls Caching State management
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