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string b = "";
  b = System.Guid.NewGuid().ToString();//»ñµÃ»á»°ID
  //дXML
  XmlDocument xml = new XmlDocument();
  XmlDeclaration dec = xml.CreateXmlDeclaration("1.0", "GBK", null);
  xml.AppendChild(dec);
  XmlNode rootnode = xml.CreateNode(XmlNodeType.Element, "userinfo", "");
  xml.AppendChild(rootnode); //Ìí¼Ó¸ú½Úµã 
  XmlNode childnode1 = xml.CreateNode(XmlNodeType.Element, "sessionID", "");
  childnode1.InnerText = b;
  rootnode.AppendChild(childnode1);

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string xml = @"<?xml version=""1.0""?>";
XmlDocument doc= new XmlDocument();
doc.LoadXml(xml);
doc.Save("c:\\a.xml");

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string xml = @" <?xml version=""1.0""?>";
XmlDocument doc= new XmlDocument();
doc.LoadXml(xml);
doc.Save("c:\\a.xml");

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