private List
     
       _ignoreList;        private void InitIgnoreList()        {            _ignoreList = new List
      
                   {                "/configuration/appSettings/add[(@key='CMSTrialKey')]",                "/configuration/appSettings/add[(@key='CMSApplicationGuid')]",                "/configuration/appSettings/add[(@key='CMSApplicationName')]",                "/configuration/connectionStrings",                "/configuration/system.web/customErrors",                "/configuration/appSettings/add[(@key='LISALastUpdatedVersionTime')]",                "/configuration/appSettings/add[(@key='LISAUpdatedVersion')]"            };        }
      
     

 

public void RemoveIgnore(XmlDocument doc)        {            foreach (var xpath in _ignoreList)            {                var nodeList = doc.SelectNodes(xpath); // apply your xpath here                if (nodeList == null)                {                    continue;                }                foreach (XmlNode node in nodeList)                {                    Console.WriteLine(node.OuterXml);                    RemoveChildNode(node);                }            }        }        private void RemoveChildNode(XmlNode childNode)        {            var parentNode = childNode.ParentNode;            if (parentNode == null) return;            parentNode.RemoveChild(childNode);            while (parentNode != null && !parentNode.HasChildNodes)            {                var ancestorNode = parentNode.ParentNode;                ancestorNode?.RemoveChild(parentNode);                parentNode = ancestorNode;            }        }