Improving Performance with the AJAX Update Panel The Update Panel control remove the requirement to refresh the whole page with each postback, which improves the user experience.
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The control toolbox in the Visual Studio IDE contains a group of controls called the 'AJAX Extensions' The Script Manager control is the most important control and must be present on the page for other controls to work.
It has the basic syntax: If you create an 'Ajax Enabled site' or add an 'AJAX Web Form' from the 'Add Item' dialog box, the web form automatically contains the script manager control.
By default, a button or other control outside an Update Panel control causes the whole page to be refreshed, as you have seen.
You can also configure a control outside the update panel to be a trigger that refreshes just the update panel.
In the above example, Button1 will do a partial page update for Update Panel1. Button two will also do a partial page update for Update Panel1 since it is listed as a trigger.
However, Button2 will not cause Update Progress1 to be displayed.
The following table shows the properties of the update panel control: The Update Progress control provides a sort of feedback on the browser while one or more update panel controls are being updated.
For example, while a user logs in or waits for server response while performing some database oriented job.
It acts as a container for the child controls within it and does not have its own interface.