The above picture shows that how an asp.net ajax application life cycle differs from its classic web application counterpart.
While using AJAX, the page is loaded entirely only once, that is the first time it is requested. Besides the HTML and CSS code that make up the page, some JavaScript files are also downloaded, namely the AJAX engine. All requests for data to the sever will then be sent as JavaScript calls to this AJAX engine. The
AJAX engine then requests information from the web server asynchronously.
Please wait for more details in ASP.Net Ajax Part 2 .
Find more: Ajax under the hood Ajax Life Cycle
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