单项选择题
You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version
3.5.
You create two user controls named UserCtrlA.ascx and UserCtrlB.ascx. The user controls postback to the server.
You create a new Web page that has the following ASPX code.
You need to ensure that the user control that is displayed meets the following requirements: ¡¤It is recreated during postback
¡¤It retains its state.
Which method should you add to the Web page?（）
A.
B.
C.
D.
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