c#中带头（声明）的xml（封装）生成

XmlDocument downLoadFilexml = new XmlDocument(); 
XmlElement root = null; 
XmlElement kisokChild = null; 
//生成xml的头 
XmlNode xmlnode= downLoadFilexml.CreateXmlDeclaration("1.0", "utf-8", null); 
downLoadFilexml.AppendChild(xmlnode); 
root = downLoadFilexml.CreateElement("test"); 
root.SetAttribute("Guid",“1”); 
root.SetAttribute("BuildID","0"); 
downLoadFilexml.AppendChild(root); 
kisokChild = downLoadFilexml.CreateElement("testChild"); 
kisokChild.SetAttribute("Interval","111"); 
root.AppendChild(kisokChild); 
Response.Write(downLoadFilexml.OuterXml); 
Response.End();