Updatepanel hidden field not updating

If you want, you can add custom client script to enhance the client user experience.

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NET Update Panel controls enable you to build rich, client-centric Web applications.

By using Update Panel controls, you can refresh selected parts of the page instead of refreshing the whole page with a postback.

This is referred to as performing a partial-page update. NET Web page that contains a Script Manager control and one or more Update Panel controls can automatically participate in partial-page updates, without custom client script.

When partial-page updates are enabled, controls can asynchronously post to the server.

An asynchronous postback behaves like a regular postback in that the resulting server page executes the complete page and control life cycle.However, with an asynchronous postback, page updates are limited to regions of the page that are enclosed in Update Panel controls and that are marked to be updated.The Update Panel control requires specific settings in a web.config file in order to function correctly.If you try to work with this control, and your website doesn't contain the required web.config file, errors appear in the The Update Panel control is a server control that helps you develop Web pages with complex client behavior that makes a Web page appear more interactive to the end user.Writing code that coordinates between server and client to update only specified parts of a Web page usually requires in-depth knowledge of ECMAScript (Java Script).However, by using the Update Panel control, you can enable a Web page to participate in partial-page updates without writing any client script.

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