i first page i wrote the code,here i want to see the serialization



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;
using System.Data.SqlClient;

public partial class _Default : System.Web.UI.Page
{
    SqlConnection Cn = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirector y|\Database.mdf;Integrated Security=True;User Instance=True");
    SqlDataAdapter da = new SqlDataAdapter("select * from dept",Cn);
    DataSet ds = new DataSet();



    protected void Page_Load(object sender, EventArgs e)
    {
        ds.Clear();
        da.Fill(ds, "dept");

    }
    protected void Btnsrialize_Click(object sender, EventArgs e)
    {
        ds.WriteXml(MapPath ("~/")+"dept.xml",XmlWriteMode.WriteSchema);
        Response.Write("serialization completed");

    }
}
 and in the second pagfe i took a gridview and wrote this code




using System;
using System.Data;
using System.Configuration;
using System.Collections;
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;
using System.Data.SqlClient;
public partial class Default2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        DataSet ds = new DataSet();
        ds .ReadXml(MapPath("~/")+"dept.xml",XmlReadMode.ReadSchema );
        GridView1.DataBind ();

    }
}


when i'm trying to execute i'm getting this error



Error 1 A field initializer cannot reference the nonstatic field, method, or property '_Default.Cn' d:\taheer\serialization\Default.aspx.cs 15 65 d:\taheer\serialization


plz help me out