单项选择题 You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. You write the following code fragment:   <asp:ScriptManager ID="ScriptManager1" runat="server" />   <asp:UpdatePanel ID="updateLabels" runat="server" UpdateMode="Conditional">   <ContentTemplate>   <asp:Label ID="Label1" runat="server" />   <asp:Label ID="Label2" runat="server" />   <asp:Button ID="btnSubmit" runat="server" Text="Submit"   onclick="btnSubmit_Click" />  </ContentTemplate>   </asp:UpdatePanel>   <asp:Label id="Label3" runat="server" />    You need to ensure that when you click the btnSubmit Button control, each Label control value is asynchronously updatable.  Which code segment should you use?（）

单项选择题 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：   <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？ （）

单项选择题 You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. You create a Microsoft Windows Communication Foundation （WCF） service that exposes the following service contract：   01 [ServiceContract]   02 public interface IBlogService   03 {   04   [OperationContract]   05   [WebGet（ResponseFormat=WebMessageFormat.Xml）]   06   Rss20FeedFormatter GetBlog（）；   07 } You configure the WCF service to use the WebHttpBinding class， and to be exposed at the following URL：   http：//www.contoso.com/BlogService    You need to store the result of the GetBlog operation in an XmlDocument variable named xmlBlog in a Web form.  Which code segment should you use？（）