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NET postbacks within the context of a Java Script XMLHttp Request.However, there are significant performance considerations to bear in mind, both in terms of behavior and speed.An Update Panel can be added to any user control or custom control; however, the page on which these controls are included must also include a Script Manager control with the property Enable Partial Rendering set to true.

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For more information, see the whitepaper, Globalization Support in ASP. Markup-Enabled Properties: control is the control that delimits the server-side content that will take part in the partial rendering functionality of the AJAX Extensions.

There is no limit to the number of Update Panel controls that can be on a page, and they can be nested.

This means that the Update Panel can work with the default data-bound controls (such as the Grid View), with user controls, and they can be programmed in script.

By default, when a partial page render is triggered, all Update Panel controls on the page will be refreshed, whether or not the Update Panel controls defined triggers for such action.

To understand how the Update Panel works, so that you can best decide when its use is appropriate, you should examine the AJAX exchange.

The following example uses an existing site and, Mozilla Firefox with the Firebug extension (Firebug captures XMLHttp Request data).Enabling partial rendering with this default page is as simple as revisiting Step 10 of this walkthrough and dropping controls onto the page.Markup-Enabled Properties: Quite simply, the above script registers a callback with the client-side AJAX runtime for when the asynchronous request has been completed. NET AJAX Extensions is the ability to do a partial or incremental page updates without doing a full postback to the server, with no code changes and minimal markup changes.The advantages are extensive – the state of your multimedia (such as Adobe Flash or Windows Media) is unchanged, bandwidth costs are reduced, and the client does not experience the flicker usually associated with a postback. NET technology brings an object-oriented and event-driven programming model and unites it with the benefits of compiled code.Consider a form that, among other things, has a postal code textbox which is supposed to populate a city and state field on a form or control.

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