遍历获取Xml子节点值

待处理的Xml文件：

<?xml version="1.0" encoding='UTF-8'?>
<ufinterface billtype="gl" filename="gledi" isexchange="Y" proc="add" receiver="01" replace="Y" roottag="sendresult" sender="ceec" successful="Y">
  <sendresult>
    <billpk>
    </billpk>
    <bdocid>AAAA</bdocid>
    <filename>BBBB</filename>
    <resultcode>CCCC</resultcode>
    <resultdescription>DDDD</resultdescription>
    <content>EEEE</content>
  </sendresult>
  <sendresult>
    <billpk>
    </billpk>
    <bdocid>aaaa</bdocid>
    <filename>bbbb</filename>
    <resultcode>cccc</resultcode>
    <resultdescription>dddd</resultdescription>
    <content>eeee</content>
  </sendresult>
</ufinterface>

<sendresult>节点下的信息

XmlDocument Xd = new XmlDocument();
Xd.Load("E:\\Books.xml");
XmlNode root = Xd.DocumentElement;
foreach (XmlNode xmlNode in root.ChildNodes)
{
  foreach (XmlNode xmlElement in xmlNode.ChildNodes)
  {  
    MessageBox.Show(xmlElement.InnerText);
  }
}

MessageBox.Show会弹出 billpk、 bdocid、 filename、 resultcode、 resultdescription、 content等节点的信息