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If you are not familiar with the technology or are new to AJAX, it is important that you take some time and understand where AJAX fits into the big picture of web development. This section helps bring you up to speed with AJAX's place in your web development toolbox.
One problem with the design of web pages (especially ASP.NET web pages) is that to refresh the data on the page, it must postback to the server. This causes the page to flicker juicy couture handbags while the page is posting, and then the page is reloaded in the browser with the results of the post. You can view the amount of data with tools such as IEHTTPHeaders and HTTPWatch. You will quickly notice that the amount of information getting posted is quite sizeable because ASP.NET applications not only postback the controls, but also post the page's ViewState. Although the technique of a postback works, it creates a lot of traffic over the wire and inherently reduces the overall scalability of your application.
Asynchronous JavaScript and XML (AJAX) is a development pattern that you can use to provide your users with a much richer user experience in your web applications. Simply stated, AJAX allows you to asynchronously load data into pieces of a page on demand marc jacobs handbags instead of loading the whole page each time data is requested.
An example of where a user experience can be enhanced by AJAX is a web page that contains related dropdown boxes. For example, say that you have a web page that supplies information on cars in which a user must select the year, make, and model of his car from dropdown boxes on the page. When a user selects a year, she populates all makes for a selected year in the make dropdown box. Additionally, when a user selects a make of car, the models dropdown is populated with models for a given year and make.
If you use traditional ASP.NET without AJAX, you will probably set the AutoPostBack property of your dropdowns to true and the page will postback (and flicker) when your user makes selections on the page.
Conversely, if you use AJAX, data can be loaded asynchronously into the list boxes as the user makes selections on the page. This is much more efficient because only the data being requested will travel in the request to the server, which could be as simple kate spade handbag as a query string appended to the end of a page request. Also, the page will not flicker as the user makes selections in the dropdowns because the post actually is happening in the background.

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