System.Xml.XmlDocument xx = new System.Xml.XmlDocument();
//'技巧收集']/菜单$$$基本技巧
string g = "Root/菜单[菜单名称='技巧收集']/菜单$$$基本技巧";
string b = "/类别[.=\""+g+"\"]";
xx.LoadXml("<类别>"+g+"</类别>");
Response.Write(xx.OuterXml);
Response.Write ("<br>");
Response.Write ("<br>");
XmlNode y = xx.SelectSingleNode(b);
Response.Write(y.InnerText);