Client Callbacks
Christian Wade had a nice small post about client call backs in Whidbey
“Client callbacks are supported by ASP.NET V2 (Whidbey). They work by submitting an asynchronous XML-HTTP request to the server. This request is processed by the server, but does not re-render the page. It is very lightweight because the form itself – consisting of viewstate, values in each field, etc. – is not submitted. It also does not fire the page’s lifecycle events, and does not cause the screen to flicker like a full postback. Plus I believe it is well supported across browsers”
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