//Remove 1st row.  It's empty by default

                XPathNavigator FirstRowNode = MainDataSource.CreateNavigator().SelectSingleNode("/my:myFields/my:e301/my:e301list/my:e301item[1]", NamespaceManager);

                FirstRowNode.DeleteSelf();

                XPathNavigator e301list = MainDataSource.CreateNavigator().SelectSingleNode("/my:myFields/my:e301/my:e301list", NamespaceManager);

                string myNamespace = NamespaceManager.LookupNamespace("my");

                using (XmlWriter writer = e301list.AppendChild())

                {

                    writer.WriteStartElement("e301item", myNamespace);

                    writer.WriteElementString("SAPNo", myNamespace, Excel_SAP_NO);

                    writer.WriteElementString("cost", myNamespace, Excel_Cost.ToString());

                    writer.WriteElementString("Description", myNamespace, Excel_Description);

                    writer.WriteElementString("Quantity", myNamespace, Excel_Quantity);

                    writer.WriteElementString("RequiredDate", myNamespace, Excel_Required_date.Year + "-" + Excel_Required_date.Month + "-" + Excel_Required_date.Day);

                    writer.WriteElementString("StorageLocation", myNamespace, Excel_Storage_location);

                    writer.WriteElementString("Remark", myNamespace, Excel_Remark);

                    writer.WriteEndElement();

                    writer.Close();

                }