NET AJAX
Extensions expose on the client
SupportsPartialRendering Boolean value indicating whether the client supports partial-page
rendering
Performing Partial Rendering
The EnablePartialRendering property of this control sets how your page will behave concerning
updates. If this is false (the default), full-page refreshes occur on round-trips to
the server. If this is true, then postbacks and full-page refreshes are suppressed and
replaced with targeted and partial updates. Instead of the application performing a full
postback, the application simulates full postbacks using the XMLHttpRequest object when
this is set to true (as you would expect from an AJAX application).
On the server side, the page is processed in the normal way, responding to any controls
that call _doPostBack(). Existing server-side postback events continue to fire, and
event handlers continue to work as they always have. It is intended, by design, that
AJAX-enabled applications change existing ASP.NET applications as little as possible.
The power of the ScriptManager control, when partial rendering is enabled, comes at
render time.
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