单项选择题

You need to ensure that when the button is clicked， both update panels update the tim without generating a postback. What should you do？（）

A.Add the following marktip to UpdatePanel1. <Triggers> <asp:PostBackTrigger ControlID="btnSave" /> </Triggers>
B.Set the UpdateMode property for the UpdatePanel2 to "Always"
C.Add the following markup to UpdatePanel2 <Triggers> <asp:AsyncPostBackTrigger ControlID="btnSave" EventName="Click" /> </Triggers>
D.Set the UpdateMode property for UpdatePanel2 to "Conditional"

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