英文资料原文（资料出处：MSDN中国站）
What's New in ASP.NET and Web Development
The .NET Framework version 3.5 includes enhancements for ASP.NET in targeted areas. Visual Studio 2008 and Microsoft Visual Web Developer Express Edition also include enhancements and new features for improved Web development.
The most significant advances are improved support for developing AJAX-enabled Web sites and support for Language-Integrated Query (LINQ). The advances include new server controls and types, a new object-oriented client type library, and full IntelliSense support in Visual Studio 2008 and Microsoft Visual Web Developer Express Edition for working with ECMAScript (JavaScript or JScript).
The following sections of this topic describe the changes in ASP.NET and Visual Web Developer.
Visual Web Developer Enhancements
ASP.NET Enhancements
The .NET Framework version 3.5 includes enhancements for ASP.NET in the following areas:
New server controls, types, and a client-script library that work together to enable you to develop AJAX-style Web applications.
Extension of server-based forms authentication, roles management, and profile services as Web services that can be consumed by Web-based applications.
A new ListView data control that displays data and that provides a highly customizable UI.
A new LinqDataSource control that exposes Language-Integrated Query (LINQ) through the ASP.NET data source control architecture.
A new merge tool (Aspnet_merge.exe) that merges precompiled assemblies to support flexible deployment and release management.
The .NET Framework version 3.5 is also integrated with IIS 7.0. You can now use ASP.NET services such as forms authentication and caching for all content types, not just ASP.NET Web pages (.aspx files). This is because ASP.NET and IIS 7.0 use the same request pipeline. The unified request processing pipeline means that you can use managed code to develop HTTP pipeline modules that work with all requests in IIS. In addition, IIS and ASP.NET modules and handlers now support unified configuration. For more information, see ASP.NET Application Life Cycle Overview for IIS 7.0.
The .NET Framework version 3.5 enables you to create Web applications that feature next-generation user interfaces with reusable client components. You can develop Web pages by using a server-based approach, a client-based approach, or a combination of both, according to your requirements. The
Server controls that support server-based
The Microsoft AJAX Library, which supports client-based, object-oriented development that is browser independent. In addition to supporting the new AJAX-enabled server controls, the client library enables you to develop custom client components that extend DOM elements or that represent a DOM element.
Server classes that enable you to develop server controls that map to custom client components whose events and properties are set declaratively. Server types that support this functionality include controls that derive from the ExtenderControl or ScriptControl base classes, or that implement the IExtenderControl or IScriptControl interfaces.
Support for script globalization and localization by using client script. Globalization enables you to display dates and numbers based on a culture value (locale). Localization enables you to specify localized content (text, images, and so on) in client components for UI elements or exception messages.
Access to Web services and to ASP.NET authentication, roles management, and profile application services.
The .NET Framework version 3.5 enables you to easily enable asynchronous partial-page updates in a page, which avoids the overhead of full-page postbacks. You can just put existing controls and markup inside UpdatePanel controls. Postbacks from inside an UpdatePanel control become asynchronous postbacks and refresh only the part of the page that is inside the panel, which creates a more fluid user experience. You can display the progress of the partial-page update by using UpdateProgress controls.
Learning About
The documentation provides extensive information to help you learn how to develop AJAX-style Web applications in ASP.NET. To get started, you follow the sequence of topics described in Adding Client Capabilities and AJAX.
Web Services and Application Services
The .NET Framework version 3.5 enables you to create both ASP.NET (.asmx) and WCF-based Web services that you can call from Web pages in client script by using the Microsoft AJAX Library. You can also call server-based application services that are exposed as Web services, which includes forms authentication, roles management, and
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