Updating a session variable without postback Sex arabi
The server sends HTML markup for only the affected elements to the browser.In the browser, the client Page Request Manager class performs Document Object Model (DOM) manipulation to replace existing HTML with updated markup. NET Web Parts is an integrated set of controls for creating Web sites that enable end users to modify the content, appearance, and behavior of Web pages directly from a browser.This whitepaper is based on the Beta 2 release of the Visual Studio 2008 and the . NET AJAX Extensions into the Base Class Library (where it was previously an add-on component available for ASP. This whitepaper also assumes that you are using Visual Studio 2008 and not Visual Web Developer Express Edition; some project templates that are referenced may not be available to Visual Web Developer Express users. 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.
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).When you use an server control and the client Page Request Manager class.When partial-page updates are enabled, controls can asynchronously post to the server. NET session state enables you to store and retrieve values for a user as the user navigates ASP. The server retains no knowledge of variable values that were used during previous requests. NET session state identifies requests from the same browser during a limited time window as a session, and provides a way to persist variable values for the duration of that session. Session variables are created by referring to the session variable by name.
This means that a Web server treats each HTTP request for a page as an independent request. The collection of session variables is indexed by the name of the variable or by an integer index.
Visual Studio 2008 does not appear to come with a pre-defined template for an ASP. However, such a template was available within Visual Studio 2005 if the Visual Studio 2005 and ASP. Consequently, configuring a web site and starting with the AJAX-Enabled Web Site template will likely be even easier, as the template should include a fully-configured web.config file (supporting all of the ASP.