Which of the following controls enables a user to add scripts and services that are specific to nested components?

Which of the following controls enables a user to add scripts and services that are specific to nested
components?

A.
UpdateProgress

B.
UpdatePanel

C.
ScriptManagerProxy

D.
Timer

Explanation:
The ScriptManagerProxy control enables a user to add scripts and services that are specific to nested
components if a page already contains the ScriptManager control. Only one instance of the

ScriptManager control can be added to a page. The page can include the control directly or indirectly
inside a nested component such as a user control or nested master page. The ScriptManagerProxy
control is used when the ScriptManager control is already in the page and a nested or parent
component requires additional features of the ScriptManager control.
Answer A is incorrect. The UpdateProgress control is used to provide status information of a partialpage update in the form of graphics or text. Multiple UpdateProgress controls can be used in a page
where each control is associated with a different UpdatePanel control or a single UpdateProgess
control can be associated with all UpdatePanel controls on the page. This is done by setting the
AssociatedUpdatePanelID property of the UpdateProgress control. The information to be displayed
is defined inside the ProgressTemplate tag of the UpdateProgress control. When a control inside an
UpdatePanel causes a postback to the server, any associated UpdateProgess is displayed.
Answer B is incorrect. The UpdatePanel control can be used to build rich, client-centric Web
applications. It is a central part of AJAX functionality in ASP.NET. It can also be used to refresh
chosen parts of the page rather than refreshing the entire page with a postback. This is referred to
as performing a partial-page update. An ASP.NET Web page that holds a ScriptManager control and
one or more UpdatePanel controls can automatically take part in partial-page updates, without
custom client script.
Answer D is incorrect. The Timer control is an AJAX server control that is used to perform postbacks
at defined intervals. The Timer control can be used to post the complete page, or it can be used with
the UpdatePanel control to perform partial-page updates at a defined interval.