【单选题】
You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. You plan to add a custom parameter in the SqlDataSource control. You write the following code fragment：  <br /> <asp：SqlDataSource ID="SqlDataSource1" runat="server"  <br /> InsertCommand="INSERT INTO [Employee] （[Field1]， [Field2]， [PostedDate]）   <br /> VALUES （@Field1， @Field2， @PostedDate）"> <br /> <InsertParameters>  <br /> <asp：Parameter Name="Field1" />  <br /> <asp：Parameter Name="Field2" />  <br /> <custom：DayParameter Name="PostedDate" /> <br /> </InsertParameters>  <br /> </asp：SqlDataSource>   <br /> You write the following code seg
A、A
B、B
C、C
D、D
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