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use   classes   in   System.Xml   namespace,   for   example   (assume   your   xml   is   in   string   s   and   it   contains   an   xmlns   definition):  
   
  <ns:vi   id="New_main"   xmlns:ns="whatever">  
  <ns:node   Expandable="checkOnce"   Selected="true"   ID="a1">  
  root<ns:node   ID="a2">  
  Node1  
          </ns:node>  
  </ns:node>  
  </ns:vi>  
   
   
  string   s   =   "................";  
   
  XmlDocument   xmldoc   =   new   XmlDocument();  
  xmldoc.LoadXml(s);  
   
  XmlNamespaceManager   xnm   =   new   XmlNamespaceManager(xmldoc.NameTable);  
  xnm.AddNamespace("ns","whatever");  
   
  XmlNode   node   =   xmldoc.SelectSingleNode("//ns:node[@ID='a1']",   xnm);  
  if   (node   !=   null)  
  {  
      XmlAttribute   att   =   xmldoc.CreateAttribute("bbi");  
      att.Value   =   "xxxxxxxxxxx";  
      node.Attributes.Append(att);  
  }


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MSXML2::IXMLDOMDocumentPtr pDoc;
MSXML2::IXMLDOMElementPtr  xmlRoot ;
 // ´´½¨DOMDocument¶ÔÏó
 HRESULT hr  =  pDoc.CreateInstance(__uuidof(MSXML2::DOMDocument40));
 if ( ! SUCCEEDED(hr))
  { 
 MessageBox( " ÎÞ·¨´´½¨DOMDocument¶ÔÏó£¬Çë¼ì²é ......

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1 bookstore.xml
<?xml version="1.0" encoding="gb2312"?>
<bookstore>
  <book genre="love" ISBN="1234123">
    <title>who am i </title>
    <author>who</author>
   ......

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