C# Remove Null Fields from XML

xml_remove_null_fields

        // XML NULL FIELD REMOVAL
        // Removes all Null fields (both with nil=true) from a XmlDoc
        
        public static XmlDocument RemoveNullFields(this XmlDocument xmldoc)
        {
            XmlNamespaceManager mgr = new XmlNamespaceManager(xmldoc.NameTable);
            mgr.AddNamespace("xsi", "http://www.w3.org/2001/XMLSchema-instance");

            XmlNodeList nullFields = xmldoc.SelectNodes("//*[@xsi:nil='true']", mgr);

            if (nullFields != null && nullFields.Count > 0)
            {
                for (int i = 0; i < nullFields.Count; i++)
                {
                    nullFields[i].ParentNode.RemoveChild(nullFields[i]);
                }
            }

            return xmldoc;
        }