单项选择题 You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. The application has a mobile Web form that contains the following ObjectList control：   <mobile：ObjectList ID="ObjectListCtrl"  OnItemCommand="ObjectListCtrl_ItemCommand" Runat="server">   <Command Name="CmdDisplayDetails" Text="Details" />   <Command Name="CmdRemove" Text="Remove" />   </mobile：ObjectList>    You create an event handler named ObjectListCtrl_ItemCommand.  You need to ensure that the ObjectListCtrl_ItemCommand handler detects the selection of the CmdDisplayDetails item.  Which code segment should you write？（）

单项选择题 You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. The application contains the following code segment：   public class CapabilityEvaluator  {  public static bool ChkScreenSize（System.Web.Mobile.MobileCapabilities cap， String arg） { int screenSize = cap.ScreenCharactersWidth * cap.ScreenCharactersHeight；   return screenSize < int.Parse（arg）；   }  }    You add the following device filter element to the Web.config file：   <filter name="FltrScreenSize"    type="MyWebApp.CapabilityEvaluator，MyWebApp"    method="ChkScreenSize" />    You need to write a code segment to verify whether the size of the device display is less than 80 characters.  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 create an AJAX-enabled Web form by using the following code fragment：   <asp：ScriptManager ID="scrMgr" runat="server" />   <asp：UpdatePanel runat="server" ID="updFirstPanel" UpdateMode="Conditional">   <ContentTemplate>   <asp：TextBox runat="server" ID="txtInfo" />   <asp：Button runat="server" ID="btnSubmit" Text="Submit" />   </ContentTemplate>   </asp：UpdatePanel>   <asp：UpdatePanel runat="server" ID="updSecondPanel" UpdateMode="Conditional">  <ContentTemplate> ...  </ContentTemplate>   </asp：UpdatePanel>    When the updFirstPanel UpdatePanel control is updated， a dynamic client script is registered. You write the following code segment in the code-behind file of the Web form：   01 protected void Page_Load（object sender， EventArgs e）   02 {   03   if（IsPostBack）   04   {   05     string generatedScript = ScriptGenerator.GenerateScript（）；   06   07   }   08 }    You need to ensure that the client-script code is registered only when an asynchronous postback is issued on the updFirstPanel UpdatePanel control.  Which code segment should you insert at line 06？ （）