获取Xml中指定子节点值

XmlDocument Xd = new XmlDocument();
Xd.Load("E:\\Books.xml");
XmlNode Sroot = Xd.SelectSingleNode("//sendresult");
Pzbh = (Sroot.SelectSingleNode("bdocid")).InnerText;
Djxx = (Sroot.SelectSingleNode("resultdescription")).InnerText;