You are implementing an ASP.NET AJAX page. You add the following control to the page. You need update the contents of the UpdatePanel without causing a full reload of the page. Which two actions should you perform?（） A: Add the following control before the UpdatePanel. B: Add the following control within the UpdatePanel. C: Add an AsyncPostBackTrigger that references Timer1. D: Add a PostBackTrigger that references Timer1.
You are implementing an ASP.NET AJAX page. You add the following control to the page. You need update the contents of the UpdatePanel without causing a full reload of the page. Which two actions should you perform?（） A: Add the following control before the UpdatePanel. B: Add the following control within the UpdatePanel. C: Add an AsyncPostBackTrigger that references Timer1. D: Add a PostBackTrigger that references Timer1.
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