System.Xml.XmlException: Root element is missing.

[Lalitha Yadav]

getting an error as root element missing while reading and xml doucement

        string path = Server.MapPath("~/App_Data/use1.xml");
        DataSet DS = new DataSet();
        DataTable dt = new DataTable("Test");
        dt.Columns.Add("totalvolume", typeof(string));
        dt.Columns.Add("totalvalue", typeof(string));
        dt.Columns.Add("totaloi", typeof(string));
        dt.Columns.Add("totaltrades", typeof(string));
        dt.Columns.Add("time", typeof(string));
        DataRow dr = dt.NewRow();
        dr["totalvolume"] = "";
        dr["totalvalue"] = "";
        dr["totaloi"] = "";
        dr["totaltrades"] = "";
        dr["time"] = "";
 
        dt.Rows.Add(dr);
        System.IO.MemoryStream ms = new System.IO.MemoryStream();
        dt.WriteXml(ms, XmlWriteMode.WriteSchema);
        //Note: If you don't Seek back to the beginning, you will start your next read from the end of the stream
        ms.Seek(0, System.IO.SeekOrigin.Begin);
 
        DataTable dt2 = new DataTable();
        dt2.ReadXml(ms);
        dt2.ReadXml(path);
 
 
 
        for (int i = 0; i < dt2.Rows.Count; i++)
        {
            AuthorLiteral.Text = Convert.ToString(dt2.Rows[i]["totalvolume"]);
            TitleLiteral.Text = Convert.ToString(dt2.Rows[i]["totalvalue"]);
            BodyLiteral.Text = Convert.ToString(dt2.Rows[i]["totaloi"]);
            Literal1.Text = Convert.ToString(dt2.Rows[i]["totaltrades"]);
            Literal2.Text = Convert.ToString(dt2.Rows[i]["time"]);
 
        }