动态删除web.config的一个节点

Question

XmlNode root = xmldoc.SelectSingleNode("configuration");
            XmlNode deletenode = xmldoc.SelectSingleNode("//authorization");
            root.RemoveChild(deletenode);
            xmldoc.Save(Server.MapPath("xml1.xml"));
好像不是这样!
提示错误:
未将对象引用设置到对象的实例

Answer 1

http://www.cnblogs.com/singlepine/archive/2005/12/09/293683.html

Answer 2

当作  xml 来改写  

Answer 3

你好.我写成这样了
        string configfile = Server.MapPath("web.config");
        XmlDocument xmldoc = new XmlDocument();
        xmldoc.Load(configfile);
        if (rbl.SelectedIndex == 0)
        {
            XmlNode node = xmldoc.SelectSingleNode("//authorization");
            node.RemoveChild(node.SelectSingleNode("//deny[@users='?'"));
            xmldoc.Save(configfile);
        }但提示错误:"要移除的节点不是此节点的子级"
   <authorization>
      <deny users="?" />
    </authorization>
deny是authorization的子节啊