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： <asp：SqlDataSource ID="SqlDataSource1" runat="server" InsertCommand="INSERT INTO [Employee] （[Field1]， [Field2]， [PostedDate]） VALUES （@Field1， @Field2， @PostedDate）"> <InsertParameters> <asp：Parameter Name="Field1" /> <asp：Parameter Name="Field2" /> <custom：DayParameter Name="PostedDate" /> </InsertParameters> </asp：SqlDataSource> You write the following code segment to create a custom parameter class： public class DayParameter ： Parameter { } You need to ensure that the custom parameter returns the current date and time. Which code segment should you add to the DayParameter class？ （）
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