<%@ OutputCache Duration="40" VaryByParam="none" %>
        <asp:Substitution ID="Substitution1" runat="server" MethodName="Get"
            onload="Substitution1_Load" onunload="Substitution1_Unload" />
   
        <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>

    protected void Page_Load(object sender, EventArgs e)
    {
        Label1.Text = "被缓存的内容是" + DateTime.Now.ToString();

    }
    public static String Get(HttpContext Hcontext)
    {
        string str = "动态更新的内容" + DateTime.Now.ToString();
        return str;
    }