Figure 6-2 Validation Control Rendering Diagnostics and error handling in Visual Studio .NET

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Figure 6-2 Validation Control Rendering Diagnostics and error handling
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Validation Data binding Custom controls Caching State management
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Essential ASPNET with Examples in C#
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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
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621 Page Validation
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Essential ASPNET with Examples in C# is the C# programmer's definitive reference for ASPNET through Adding 11 It provides experienced enables both with the information needed support it) and server-side version a validation control to a form programmers client-side (for browsers thatto fully understand the validation Server-side validation occurs ASPNET to has robust and and all the controls applications technology, and is a clear guide to using once a page buildbeen loaded well architected Webon the page have had their values restored The Page class maintains a list of all the validation controls defined on that page in its Validators collection Each validation control implements the IValidator interface, shown in This book begins with a discussion of the rationale behind the design of ASPNET and an introduction to how Listing 6-3 This interface defines two properties, ErrorMessage and IsValid, new features called it builds on top of the NET framework Subsequent chapters explore the host of and a methodin ASPNET, Validate() 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 forIValidator Interface Listing 6-3 The building Web-based applications in C# Among the topics explored in depth are:
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public interface IValidator { ASPNET architecture string ErrorMessage {get; set;} bool IsValid {get; set;} Web forms void Validate(); } Configuration
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HTTP pipeline Invoking the Validate() method on a validation control requests the control to execute its validation algorithm The Page class also exposes a top-level Validate() method that can be used to collectively Diagnostics and error handling invoke all Validate() methods on all validation controls on that page Similarly, the Page class exposes a Boolean property, IsValid, indicating whether or not all the validation controls succeeded their validation Validation on that page Figure 6-3 shows this validation control architecture Data binding Custom controls Caching State management
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Figure 6-3 Validation Control Architecture
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As soon as you place a validation Examples in it is Essential ASPNET with control on a page,C# imperative that you check the IsValid flag of the fails on a page, the code for that page will not execute On the contrary, the only thing that happens when server-side validation fails is that the IsValid flag of the Page class is set to false, and each validation Publisher : Addison Wesley control that failed renders itself as a visible span so that the error indicator shows up when the page is Pub Date : February 11, 2003 redisplayed to the user
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ISBN : 0-201-76040-1 Pages : 432 It is also important to realize exactly when server-side validation occurs The IsValid flag will be set
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Page class before using any of the data posted by the client It is a common misconception that if validation ByFritz Onion
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properly after the validation controls have had their Validate() routines invoked, which will happen implicitly in the Page class immediately after the Load event fires This means that if you are looking at data submitted by the user in a handler for the Load event, there is no way for you to know whether it is valid well-conceived and you should book has extensive knowledge in server-side event handlers such as "This yet or not Instead, well-writtenwork with client-submitted data and priceless experience overflowing the Click event of a Button, true essence the Page will have performed validation, and you technical from its pages It captures theat which point of ASPNET and walks the reader to a high level of can safelyand check the IsValid property If you truly need to access client-submitted data in your Load handler, you architectural skill"-J Fred Maples, Director of Software Engineering, NASDAQcom can always explicitly invoke the Validate() method of your Page class Figure 6-4 shows the complete post-back sequence and where validation the C# programmer's definitive reference for ASPNET through Essential ASPNET with Examples in C# is occurs in that sequence version 11 It provides experienced programmers with the information needed to fully understand the technology, and is a clearFigureto using ASPNET toValidation During Post-Back guide 6-4 Server-Side build robust and well architected Web applications
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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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