关于数据页面缓存问题，大家帮我可那看这个那里错了？

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<%@ OutputCache Duration="1000" SqlDependency="DLOcean:PORE_DATA" VaryByParam="none" %>
<!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>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
        <asp:ScriptManager ID="ScriptManager1" runat="server" />
        <div>
         <table>
        <tr>
            <td>
                 <asp:Label ID="lbl1" runat="server"></asp:Label>
            </td>
        </tr>
        <tr>
            <td>
               <asp:GridView ID="gv1" runat="server" AllowPaging="True" AutoGenerateColumns="False" >
                   
               </asp:GridView>
            </td>
        </tr>
    </table>
        </div>
    </form>
</body>
</html>
后台代码：
 protected void Page_Load(object sender, EventArgs e)
    {
        this.lj();
    }
    private void lj()
    {
        DataSet ds=new DataSet();
        SqlConnection con = new SqlConnection("server=.;database=DLOcean;uid=sa;pwd=sa");
        con.Open();
        SqlDataAdapter dar = new SqlDataAdapter();
        dar.SelectCommand = new SqlCommand("select ID,CD_ID,AD,DATA from PORE_DATA",con);
        dar.Fill(ds, "PORE_DATA");
        this.gv1.DataSource = ds.Tables["PORE_DATA"].DefaultView;
        this.gv1.DataBind();
        con.Close();
    }
错误信息：
OutputCache 指令的“DLOcean:PORE_DATA”SqlDependency 属性无效。详细错误信息: 无法在配置中找到“DLOcean”数据库。