You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. You create a page that contains the following code fragment：  
<asp：ListBox ID="lstLanguages" AutoPostBack="true" runat="server" />   
You write the following code segment in the code-behind file for the page：  
void BindData（object sender， EventArgs e） {  
lstLanguages.DataSource = 
CultureInfo.GetCultures（CultureTypes.AllCultures）；  
lstLanguages.DataTextField = "EnglishName"； 
lstLanguages.DataBind（）；  
}  
You need to ensure that the lstLanguages ListBox control maintains the selection of the user during postback. 
Which line of code should you insert in the constructor of the page？（）

单项选择题You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. You create a page that contains the following control：   <asp：Calendar EnableViewState= false  ID= calBegin  runat= server   >    You write the following code segment in the code-behind file for the page：   void LoadDate（object sender， EventArgs e） {   if （IsPostBack） {   calBegin.SelectedDate = （DateTime）ViewState[ date ]；   }  }    void SaveDate（object sender， EventArgs e） { ViewState[ date ] = calBegin.SelectedDate；   }   You need to ensure that the calBegin Calendar control maintains the selected date.  Which code segment should you insert in the constructor of the page？（）

A.A
B.B
C.C
D.D

单项选择题You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. You create a Web page that has a GridView control named GridView1. The GridView1 control displays the data from a database named Region and a table named Location. You write the following code segment to populate the GridView1 control：   01 protected void Page_Load（object sender， EventArgs e）   02 {   03   string connstr；   04   05   SqlDependency.Start（connstr）；   06   using （SqlConnection connection =   07     new SqlConnection（connstr））   08   {   09     SqlCommand sqlcmd = new SqlCommand（）；   10     DateTime expires = DateTime.Now.AddMinutes（30）；   11     SqlCacheDependency dependency = new   12       SqlCacheDependency（ Region ，  Location ）；  13     Response.Cache.SetExpires（expires）；   14     Response.Cache.SetValidUntilExpires（true）；   15     Response.AddCacheDependency（dependency）；   16   17     sqlcmd.Connection = connection；   18     GridView1.DataSource = sqlcmd.ExecuteReader（）；   19     GridView1.DataBind（）；   20   }   21 }  You need to ensure that the proxy servers can cache the content of the GridView1 control.  Which code segment should you insert at line 16？（）

A.Response.Cache.SetCacheability(HttpCacheability.Private); 
B.Response.Cache.SetCacheability(HttpCacheability.Public); 
C.Response.Cache.SetCacheability(HttpCacheability.Server); 
D.Response.Cache.SetCacheability(HttpCacheability.ServerAndPrivate);

单项选择题You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. You create a custom Web user control named SharedControl. The control will be compiled as a library.  You write the following code segment for the SharedControl control： 01 protected override void OnInit（EventArgs e）   02 {   03   base.OnInit（e）；   04   05 }    All the master pages in the ASP.NET application contain the following directive. <%@ Master Language= C#  EnableViewState= false  %>    You need to ensure that the state of the SharedControl control can persist on the pages that reference a master page.  Which code segment should you insert at line 04？（）

A.Page.RegisterRequiresPostBack(this); 
B.Page.RegisterRequiresControlState(this); 
C.Page.UnregisterRequiresControlState(this); 
D.Page.RegisterStartupScript("SharedControl","server");

单项选择题You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. You create a Web page named Default.aspx in the root of the application. You add an ImageResources.resx resource file in the App_GlobalResources folder. The ImageResources.resx file contains a localized resource named LogoImageUrl. You need to retrieve the value of LogoImageUrl.  Which code segment should you use？（）

A.A
B.B
C.C
D.D

单项选择题You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. The application allows users to post comments to a page that can be viewed by other users. You add a SqlDataSource control named SqlDS. You write the following code segment：   01 private void SaveComment（）   02 {   03   string ipaddr；   04   05   SqlDS1.InsertParameters[ IPAddress ].DefaultValue = ipaddr；   06   ...  07   SqlDS1.Insert（）；   08 }   You need to ensure that the IP Address of each user who posts a comment is captured alongwith the user’s comment.  Which code segment should you insert at line 04？（）

A.ipaddr = Server["REMOTE_ADDR"].ToString(); 
B.ipaddr = Session["REMOTE_ADDR"].ToString(); 
C.ipaddr = Application["REMOTE_ADDR"].ToString(); 
D.ipaddr = Request.ServerVariables["REMOTE_ADDR"].ToString();