ASP.NET 4 Unleashed

Passing Additional Information During an Asynchronous Postback

You can pass additional items from the web server to the web browser during an asynchronous postback. Passing additional items is useful when the area that you need to update on a page does not fall into a neat little rectangle. For example, you might want to update a page’s title or a page’s meta tags based on the results of an asynchronous query.

The page in Listing 38.16 contains a DetailsView control that you can use to navigate the contents of the Movie database table. The DetailsView control is contained inside of an UpdatePanel control so that a postback does not happen when you navigate to a new movie.

Listing 38.16. UpdatePanelDataItem.aspx

When you navigate to a new ...