The Client-Side Runtime
A fundamental principle of AJAX is to perform as much processing as possible on the client. This includes rendering, data retrieval, and loading multiple applications throughout the life cycle of the page. Where the life cycle of classic ASP.NET pages could be very short, the page life cycle can be very long with an AJAX application. Your users might not reload the page all day because the data can be constantly refreshed without reloading the page.
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ASP.NET AJAX 3.5 builds on the JavaScript framework included with ASP.NET 2.0 AJAX Extensions but includes support for browser history (the Back button) through ...
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