Microsoft ASP.NET AJAX enables you to quickly create Web pages that include a rich user experience with responsive and familiar user interface (UI) elements. ASP.NET AJAX provides client-script libraries that incorporate cross-browser ECMAScript (JavaScript) and dynamic HTML (DHTML) technologies, and it integrates them with the ASP.NET 2.0 server-based development platform. By using ASP.NET AJAX, you can improve the user experience and the efficiency of your Web applications.
ASP.NET AJAX enables you to build rich Web applications that have many advantages over Web applications that are completely server-based. ASP.NET AJAX applications offer:
*       Improved efficiency by performing significant parts of a Web page's processing in the browser.
*       Familiar UI elements such as progress indicators, tooltips, and pop-up windows.
*       Partial-page updates that refresh only the parts of the Web page that have been updated.
*       Client integration with ASP.NET application services for forms authentication and user profiles.
*       Integration of data from different sources through calls to Web services.
*       A framework that simplifies customization of server controls to include client capabilities.
*       Support for the most popular and generally used browsers, including Microsoft Internet Explorer, Mozilla Firefox, and Apple Safari.

ASP.NET AJAX Architecture
ASP.NET AJAX consists of client-script libraries and of server components that are integrated to provide a robust development framework. In addition to ASP.NET AJAX, you can use the ASP.NET AJAX Control Toolkit and the community-supported features in the ASP.NET AJAX Futures releases.

ASP.NET AJAX Server and client architecture
ASP.NET AJAX Server Architecture
The ASP.NET AJAX server components consist of ASP.NET controls and components to manage the UI and flow of an application, and to manage serialization, validation, control extensibility, and so on. There are also ASP.NET Web services that enable you to access ASP.NET application services for forms authentication and user profiles.
ASP.NET AJAX Server Controls
The ASP.NET AJAX server controls consist of server and client code that integrate to produce AJAX-like behavior. The following list describes the most frequently used ASP.NET AJAX server controls.
Manages script resources for client components, partial-page rendering, localization, globalization, and custom user scripts. The ScriptManager control is required in order to use the UpdatePanelUpdateProgress, and Timer controls.
Enables you to refresh selected parts of the page instead of refreshing the whole page by using a synchronous postback.
Provides status information about partial-page updates in UpdatePanel controls.
Performs postbacks at defined intervals. You can use the Timer control to post the whole page, or use it together with the UpdatePanel control to perform partial-page updates at a defined interval.
ASP.NET AJAX Web Services
ASP.NET AJAX provides Web services that you can use from client script to work with ASP.NET application services for forms authentication and user profiles. This enables you to use client script to help protect resources by using forms authentication and to persist user-specific settings on the server. In addition, ASP.NET AJAX includes network components that make it easy to return results from any Web service call. For information and examples, see Asynchronous Communication Layer Overview and ASP.NET Application Services Tutorials.
ASP.NET AJAX Server Control Extensibility
ASP.NET AJAX enables you to create custom ASP.NET AJAX server controls that include client behaviors. For more information and examples, see the ASP.NET AJAX Extensibility tutorials and the Microsoft ASP.NET AJAX Control Toolkit.
ASP.NET AJAX Client Architecture
The ASP.NET AJAX client-script libraries consist of JavaScript (.js) files that provide features for object-oriented development. This has not been previously available to JavaScript developers. The object-oriented features included in the ASP.NET AJAX client-script libraries enable a new level of consistency and modularity in client scripting. The following layers are included in the ASP.NET AJAX script libraries:
*       A browser compatibility layer. This provides compatibility across the most frequently used browsers (including Microsoft Internet Explorer, Mozilla Firefox, and Apple Safari) for your ASP.NET AJAX scripts.
*       ASP.NET AJAX core services, which include extensions to JavaScript, such as classes, namespaces, event handling, inheritance, data types, and object serialization.
*       An ASP.NET AJAX base class library, which includes components such as string builders and extended error handling.
*       A networking layer that handles communication with Web-based services and applications, and that manages asynchronous remote method calls.
ASP.NET AJAX Control Toolkit
The ASP.NET AJAX Control Toolkit is a collection of samples and components that show you some of the experiences you can create with rich client ASP.NET AJAX controls and extenders. The Control Toolkit provides both samples and a powerful SDK to simplify creating and reusing your custom controls and extenders. You can download the ASP.NET AJAX Control Toolkit from the ASP.NET Ajax Web site.
ASP.NET AJAX Community-supported Futures Releases
The ASP.NET AJAX community-supported Futures releases provide features that extend the core ASP.NET AJAX platform with functionality that remains under development and that is not included in the Microsoft ASP.NET AJAX release. This includes additional extender controls, support for client declarative syntax (xml-script), and more. To download and learn more about the community-supported Future release, see the ASP.NET AJAX Web site.


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