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 | English | Chinese | Japan | Korean | - 88 - Test Information Co., Ltd. All rights reserved. data from a database named Region and a table named Location. You write the following code segment to populate the GridView1 control. (Line numbers are included for reference only.) 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、A
- B、B
- C、C
- D、D
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