private string xmlPath=Application.StartupPath.Replace("bin\\Debug","") + "InstallFiles\\BookMarks.xml";

        private XmlDocument _XmlDoc;

        public XmlDocument XmlDoc 

        {

            get 

            {

                _XmlDoc = new XmlDocument();

                _XmlDoc.Load(xmlPath);

                return _XmlDoc;

            }

        }

       public bool DelBookName(string nodeName) 

        {

            XmlNodeList xmlNodes = XmlDoc.SelectSingleNode("BookMarks").ChildNodes;

            foreach (XmlNode node in xmlNodes)

            {

                XmlElement xmlEle = (XmlElement)node;

                if (xmlEle.GetAttribute("Name").Equals(nodeName))

                {

                    node.ParentNode.RemoveChild(node);

                    //xmlEle.ParentNode.RemoveChild(node);

                    XmlDoc.Save(xmlPath);

                    return true;

                }

             }

             return false;

        }