【单选题】
You work as a Web Developer at Certkiller.com. You are in the process of creating a Webapplication. <br /> You decide to make use of Microsoft ASP.NET 3.5 in order to create the application. The followingmarkup is present on the page： <br /> <asp：TextBox ID="_statusTextBox" runat="server"/> <br /> <asp：Button ID="_button" runat="server" Text="Filter"/> <br /> <asp：SqlDataSource ID="_sqlDataSource" runat="server" <br />  ConnectionString="<%$ ConnectionStrings：Certkiller %>" <br /> SelectCommand="GetUsers" SelectCommandType="StoredProcedure" <br /> FilterExpression="Active=1 AND Name LIKE ’{0}%’"> <br /> <FilterParameters> <br /> <asp：ControlParameter ControlID="_status
A、You should ensure that a default value for the Status property of the ControlParameter controlis set.
B、You should ensure that the PropertyName property of the ControlParameter control is set toText.
C、You should ensure that the ControlParameter control’s ConvertEmptyStringToNull property isset to false.
D、You should ensure that the {0} placeholder in the FilterExpression property is replaced with the（？） symbol.
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