Return DataTable Data in XML Using WCF

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C#

WCF

Hi All,
I want to return Large amount of data From wcf web service in XML format. I used return type XMLDocument, but IT is giving error : "This operation is not supported in the WCF Test Client because it uses type system.object[]"

below is my code:

public XmlDocument GetMasterData(double TerritoryCode, double RegionCode, double ZoneCode)
        {
            SqlConnection conn = new SqlConnection(path_jnj);
            SqlCommand cmd;
            XmlDocument doc = new XmlDocument();
            try
            {
                cmd = new SqlCommand("GetMastersForAPK", conn);
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.Parameters.AddWithValue("@TerritoryCode", TerritoryCode);
                cmd.Parameters.AddWithValue("@RegionCode", RegionCode);
                cmd.Parameters.AddWithValue("@ZoneCode", ZoneCode);
                DataTable dtRDS = new DataTable();
                SqlDataAdapter daRDS = new SqlDataAdapter();
                daRDS.SelectCommand = cmd;
                daRDS.Fill(dtRDS);
                               
                XmlDeclaration dec = doc.CreateXmlDeclaration("1.0", null, null);
                doc.AppendChild(dec);
                XmlElement root = doc.CreateElement("JNJ");
                doc.AppendChild(root);
                XmlNode chnode1, chnode2, chnode3, chnode4, chnode5, chnode6, chnode7, chnode8, chnode9, chnode10;
                foreach (DataRow row in dtRDS.Rows)
                {
                    chnode1 = doc.CreateNode("element", "SAPID", "");
                    chnode1.InnerText = row[0].ToString();
                    root = doc.DocumentElement;
                    root.AppendChild(chnode1);

                    chnode2 = doc.CreateNode("element", "CustomerName", "");
                    chnode2.InnerText = row[2].ToString();
                    root = doc.DocumentElement;
                    root.AppendChild(chnode2);

                    chnode3 = doc.CreateNode("element", "SMCode", "");
                    chnode3.InnerText = row[4].ToString();
                    root = doc.DocumentElement;
                    root.AppendChild(chnode3);

                    chnode4 = doc.CreateNode("element", "SMName", "");
                    chnode4.InnerText = row[6].ToString();
                    root = doc.DocumentElement;
                    root.AppendChild(chnode4);

                    chnode5 = doc.CreateNode("element", "RMCode", "");
                    chnode5.InnerText = row[8].ToString();
                    root = doc.DocumentElement;
                    root.AppendChild(chnode5);

                    chnode6 = doc.CreateNode("element", "RMName", "");
                    chnode6.InnerText = row[10].ToString();
                    root = doc.DocumentElement;
                    root.AppendChild(chnode6);

                    chnode7 = doc.CreateNode("element", "RtrId", "");
                    chnode7.InnerText = row[12].ToString();
                    root = doc.DocumentElement;
                    root.AppendChild(chnode7);

                    chnode8 = doc.CreateNode("element", "RtrName", "");
                    chnode8.InnerText = row[14].ToString();
                    root = doc.DocumentElement;
                    root.AppendChild(chnode8);

                    chnode9 = doc.CreateNode("element", "RtrCategoryCode", "");
                    chnode9.InnerText = row[16].ToString();
                    root = doc.DocumentElement;
                    root.AppendChild(chnode9);

                    chnode10 = doc.CreateNode("element", "ClassDesc", "");
                    chnode10.InnerText = row[18].ToString();
                    root = doc.DocumentElement;
                    root.AppendChild(chnode10);
                }
            }
            catch (FaultException Fex)
            {}
            return doc;
        }

please provide me solution.
Thanks in Advance