Following are some major improvements in the AJAX Library in ASP.NET 4.0.
Script Loader : The new script loader control enables developers to load all the required scripts only once, thereby eliminating the unnecessary subsequent requests to the server. It supports lazy loading so it loads scripts only when necessary. It also supports the jQuery script and custom scripts.
JQuery Integration : ASP.NET 4.0 extensively supports the integration for jQuery by mixing the jQuery and Ajax plug-ins seamlessly.
Client Data Access : By using predefined client controls inside the Ajax Library, developers can easily build asynchronous data-driven applications. For example, client DataView control will display one or more records by consuming a WCF service. All operations will be handled by the Ajax asynchronously.
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