https://www.infopathdev.com:443/forums/45.aspxenCommunityServer 2007 SP3 (Build: 31118.962)https://www.infopathdev.com:443/forums/thread/98391.aspxSun, 20 Jul 2014 09:00:34 GMT033a2e2d-04e2-4a9d-be01-a4634161eefd:98391Rahul20110https://www.infopathdev.com:443/forums/thread/98391.aspxhttps://www.infopathdev.com:443/forums/commentrss.aspx?SectionID=45&PostID=98391I am reading the term store metadata information from /_vti_bin/TaxonomyClientService.asmx?WSDL webservice to fill the infopath dropdown list.But I am getting the "Object reference not set to an instance of an object" error at the "newNode = nav.Clone();" line. Here is my code: XPathNavigator mainNav = this.MainDataSource.CreateNavigator(); cleanupDropdown(mainNav, "/my:myFields/my:Countries"); XPathNavigator termSetNav = this.DataSources["GetCountries"].CreateNavigator(); string xPath = "/dfs:myFields/dfs:dataFields/tns:GetChildTermsInTermSetResponse/tns:GetChildTermsInTermSetResult"; XPathNavigator nodeNav = termSetNav.SelectSingleNode(xPath, this.NamespaceManager); string resultXML = nodeNav.Value.ToString(); XmlDocument termSetXML = new XmlDocument(); termSetXML.LoadXml(resultXML); XmlNodeList terms = termSetXML.GetElementsByTagName("T"); XPathNavigator nav = this.CreateNavigator(). SelectSingleNode("/my:myFields/my:Countries", this.NamespaceManager);// Note: "/my:myFields/my:Countries" => Group Countries foreach (XmlNode term in terms) { XmlNode v = term.SelectSingleNode("LS/TL"); string termValue = v.Attributes["a32"].Value; string termGuid = term.Attributes["a9"].Value; XPathNavigator newNode = null; newNode = nav.Clone(); //Object reference not set to an instance of an object. newNode.SelectSingleNode("/my:myFields/my:Countries/my:Displayname", this.NamespaceManager).SetValue(termValue); newNode.SelectSingleNode("/my:myFields/my:Countries/my:Value", this.NamespaceManager).SetValue(termValue); nav.InsertAfter(newNode); newNode = null; } nav.DeleteSelf(); nav = null;