25.1 Introduction
Ajax (Asynchronous JavaScript and XML) is a collection of special script-based classes. These classes enable the client and the server to interact in such a way that only a region of a page is re-created, re-formatted, sent back to the client, and re-rendered in the client’s browser. To understand how the Ajax classes work, we need to contrast the concepts of synchronous postbacks and full-page rendering with asynchronous postbacks and partial-page rendering .
A synchronous postback occurs when a page is sent to the server and processed (all of the ...
