DataTable Xml

 DataTable dt = new DataTable("MatrixInfo");
        DataColumn dc1 = new DataColumn("itemID", Type.GetType("System.String"));
        DataColumn dc2 = new DataColumn("itemName", Type.GetType("System.String"));
        dt.Columns.Add(dc1);
        dt.Columns.Add(dc2);
        for (int i = 0; i < al.Count; i++)
        {
            DataRow dr = dt.NewRow();
            DS_Option dso = (DS_Option)al[i];
            dr["itemID"] = dso.ID;
            dr["itemName"] = dso.Name;
            dt.Rows.Add(dr);
        }
        string xmlstr;
        System.IO.StringWriter writer = new System.IO.StringWriter();
        dt.WriteXml(writer);
        xmlstr = writer.ToString();
        return xmlstr;