Exploring the Ajax server extensions in VS .NET

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Exploring the Ajax server extensions
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In this chapter:
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Ajax for ASP.NET developers
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What makes ASP.NET AJAX unique and separates it from other Ajax toolkits and frameworks is the fact that its architecture spans both the client and server. In addition to a rich set of JavaScript libraries, it provides a set of server controls to assist in Ajax development. In the previous two chapters, we revealed the basics of the Microsoft Ajax Library and its ambitions of simplifying Ajax and JavaScript for client-side development. Because most Ajax development originates from the client, these chapters are a pivotal part of the book and will serve as a valuable reference for many of the later chapters. In this chapter, we continue our discussion of ASP.NET AJAX by delving into the server-side portion of the framework, called the Ajax server extensions. If you re familiar with the basics of the server extensions, you may wish to skim this chapter or jump ahead to chapters 6 and 7 to gain a deeper understanding of their inner workings. Nonetheless, the foundation we lay here is important and will be beneficial for even experienced Ajax developers. As the name implies, Ajax server extensions offer Ajax support for server-side development. To help you understand why this is so valuable, we ll expose some of the issues and challenges of Ajax development from the client perspective.
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Ajax for ASP.NET developers
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An Ajax application runs in the browser and is written primarily in JavaScript. This process is initiated when a richer and more intuitive application is delivered from the server to the browser. This includes the logic for rendering and updating the UI, as well as communicating with a server for data needs. The end result is an application that runs more smoothly over time and provides a better user experience. This sounds great and is the recommended approach for Ajax development. However, with this approach comes a new set of issues to address. For example, what about ASP.NET developers who are unfamiliar with JavaScript or prefer to keep the application logic on the server What about the rare cases when the browser has JavaScript disabled What about complex controls like the GridView does it make sense to rewrite these controls for the client What about security and exposing the application logic on the client These are just a few of the common concerns that surface with Ajax development. Thankfully, the ASP.NET AJAX framework offers an alternative.
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What are the Ajax server extensions
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Built on top of ASP.NET 2.0, the Ajax server extensions include a new set of server controls and services that simulate Ajax behavior on the client. The extensions
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Exploring the Ajax server extensions
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don t adhere to the Ajax model in the traditional sense but respond in a manner that provides that illusion to the end user. In this chapter, we ll focus on the server controls that provide this functionality; the next chapter will give you some insight into how ASP.NET services such as authentication and profile are also supported. As a quick overview, let s look at the server controls you have at your disposal. Figure 4.1 Figure 4.1 The Ajax server extensions are a new set of server controls that shows the new controls that are available to complement the already powerful the ASP.NET toolbox in Visual Studio. We ll controls in the ASP.NET toolbox. cover each of these controls in this chapter by explaining when and how they should be used. Since you re reading this book (and have come this far), chances are you ve previously done some ASP.NET development. If you re looking to take an application you wrote previously and add Ajax support to it, then the next few sections should be right up your alley.
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