Question:You are writing a page that contains an UpdatePanel for partial-page updates. You
wish to notify the user that the update is processing only if the update takes longer
than 5 seconds. Which actions should you take? 

A Add a second UpdatePanel to the page. Set it to trigger based on the first UpdatePanel.
Set the contents of this UpdatePanel to read “Processing, please wait.” 

B Add an UpdateProgress control to the UpdatePanel. Set its DisplayAfter attribute to
5,000. Set its ProgressTemplate contents to read “Processing, please wait.” 

C Add a ProgressBar control to the page. Write code on the server to call back to the
client asynchronously to update the ProgressBar control after 5 seconds. 

D Create a hidden <div> tag on your page that contains the text “Processing, please
wait.” Set the <div> tag’s ID to match that of the UpdatePanel. Set the UpdatePanel
control’s Interval property to 5,000. 

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