Create New XML File

Dim  tmpXml  As   New  Xml.XmlDocument
         Dim  tmpNode  As  Xml.XmlNode
         Dim  subNode  As  Xml.XmlNode
         Dim  g_XmlDoc  As   New  Xml.XmlDocument

         ' 初始化XML
        tmpXml.LoadXml( " <?xml version=""1.0"" encoding=""GB2312""?><Root></Root> " )

         ' 添加用户信息节点"
        tmpNode  =  tmpXml.CreateNode(Xml.XmlNodeType.Element,  " User " ,  Nothing )
        subNode  =  tmpXml.CreateNode(Xml.XmlNodeType.Element,  " UserID " ,  Nothing )
        subNode.InnerText  =   " uid "
        subNode  =  tmpXml.CreateNode(Xml.XmlNodeType.Element,  " UserName " ,  Nothing )
        subNode.InnerText  =   " uname "
        tmpNode.AppendChild(subNode)
        tmpXml.DocumentElement.AppendChild(tmpNode)

         ' 添加用户信息节点
        tmpNode  =  tmpXml.CreateNode(Xml.XmlNodeType.Element,  " Shop " ,  Nothing )
        subNode  =  tmpXml.CreateNode(Xml.XmlNodeType.Element,  " ShopID " ,  Nothing )
        subNode.InnerText  =   " shopid "
        tmpNode.AppendChild(subNode)
        subNode  =  tmpXml.CreateNode(Xml.XmlNodeType.Element,  " ShopName " ,  Nothing )
        subNode.InnerText  =   " test "
        tmpNode.AppendChild(subNode)

        tmpXml.DocumentElement.AppendChild(tmpNode)
        tmpXml.Save( " text.xml " )
         MsgBox ( " ok " )

RESULT:

<? xml version="1.0" encoding="GB2312" ?>
< Root >
   < User >
     < UserName > uname </ UserName >
   </ User >
   < Shop >
     < ShopID > shopid </ ShopID >
     < ShopName > test </ ShopName >
   </ Shop >
</ Root >

C#
 XmlDocument xmlDoc = new XmlDocument();
        XmlNode titleNode = null;
        XmlNode sortNode = null;
        XmlNode dateNode = null;
        XmlNode contentNode = null;
        
        string xmlStr = "<?xml version='1.0' encoding='GB2312'?>";
        xmlStr += "<?xml-stylesheet type='text/xsl' href='new.xsl'?><News></News>";
        xmlDoc.LoadXml(xmlStr);

        titleNode = xmlDoc.CreateNode(XmlNodeType.Element, "Title", null);
        titleNode.InnerText = "titleNode_value";
        xmlDoc.DocumentElement.AppendChild(titleNode);

        sortNode = xmlDoc.CreateNode(XmlNodeType.Element, "SortName", null);
        sortNode.InnerText = "sortName_value";
        xmlDoc.DocumentElement.AppendChild(sortNode);

        dateNode = xmlDoc.CreateNode(XmlNodeType.Element, "Date", null);
        dateNode.InnerText = "2007-05-30";
        xmlDoc.DocumentElement.AppendChild(dateNode);

        contentNode = xmlDoc.CreateNode(XmlNodeType.Element, "Content", null);
        contentNode.InnerText = "content_value";
        xmlDoc.DocumentElement.AppendChild(contentNode);

        xmlDoc.Save(Server.MapPath("xml\\news2.xml"));

        Response.Write("ok");

Result
<?xml version="1.0" encoding="GB2312"?>
<?xml-stylesheet type='text/xsl' href='news.xsl'?>
<News>
  <Title>titleNode_value</Title>
  <SortName>sortName_value</SortName>
  <Date>2007-05-30</Date>
  <Content>content_value</Content>
</News>