What is the ajax life cycle in asp.net 3.5?

what is the life cycle of Ajax in 3.5? i mean to ask t开发者_StackOverflow社区hat how Ajax works in VS2008 ?

---

The client browser sends an asynchronous HTTP request to the server and the server would process this request as any other normal HTTP request. The only difference to the client is that during the processing of this request the browser doesn't freeze and the user doesn't need to wait for the request to finish and could perform some other tasks due to the asynchronous nature of AJAX.

From the perspective of the server there's absolutely no difference: incoming HTTP request, processing, returning a response.