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Low Level using HttpCachePolicy Class

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs"  Inherits="Default_aspx" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server">     <title>Output Caching</title> </head> <body>     <form id="form1" runat="server">     <div>     <h1>Output Caching</h1>     <h2>Low Level using HttpCachePolicy Class</h2>      <asp:Label ID="lblTime" runat="server" />       <br/>       UserName:&nbsp;&nbsp;&nbsp;       <asp:Label ID="lblUserName" runat="server" />       <br/>       State:&nbsp;&nbsp;&nbsp;       <asp:Label ID="lblState" runat="server" />     </div>     </form> </body> </html> File: Default.aspx.cs using System; using System.Data; using System.Configuration; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; public partial class Default_aspx : System.Web.UI.Page  {     protected void Page_Load(object sender, EventArgs e)     {      Response.Cache.SetExpires(DateTime.Now.AddSeconds(10));      Response.Cache.SetCacheability(HttpCacheability.Public);      lblTime.Text = "This page was loaded at " + DateTime.Now.ToLongTimeString();          lblUserName.Text = Request.Params["username"];      lblState.Text = Request.Params["state"];     } }