<?xml version="1.0" encoding="utf-8"?><Advertisements>  <Ad>    <ImageUrl>001.jpg</ImageUrl>    <NavigateUrl>001.aspx</NavigateUrl>    <Impressions>10</Impressions>    <Keyword>gucas01</Keyword>  </Ad>  <Ad>    <ImageUrl>002.jpg</ImageUrl>    <NavigateUrl>002.aspx</NavigateUrl>    <Impressions>20</Impressions>    <Keyword>gucas02</Keyword>  </Ad>  <Ad>    <ImageUrl>003.jpg</ImageUrl>    <NavigateUrl>003.aspx</NavigateUrl>    <Impressions>30</Impressions>    <Keyword>gucas03</Keyword>  </Ad>  <Ad>    <ImageUrl>004.jpg</ImageUrl>    <NavigateUrl>004.aspx</NavigateUrl>    <Impressions>40</Impressions>    <Keyword>gucas04</Keyword>  </Ad>  <Ad>    <ImageUrl>005.jpg</ImageUrl>    <NavigateUrl>005.aspx</NavigateUrl>    <Impressions>50</Impressions>    <Keyword>gucas05</Keyword>  </Ad>  <Ad>    <ImageUrl>google.gif</ImageUrl>    <NavigateUrl>http://www.google.com</NavigateUrl>    <Impressions>30</Impressions>    <Keyword>google</Keyword>  </Ad></Advertisements>

/// <summary>    /// 创建XML文件    /// </summary>    /// <param name="filename"></param>    public void CreateXmlFile(string filename)    {        XmlDocument xmldoc = new XmlDocument();        XmlNode node;        node = xmldoc.CreateXmlDeclaration("1.0", "utf-8", null);        xmldoc.AppendChild(node);        XmlNode root = xmldoc.CreateElement("Users");        xmldoc.AppendChild(root);        CreateNode(xmldoc, root, "UserName", "zhengyd");        CreateNode(xmldoc, root, "Email", "zhengyd@gucas.ac,cn");        CreateNode(xmldoc, root, "Url", "www.gucas.an,cn");        CreateNode(xmldoc, root, "Age", "27");        try        {            xmldoc.Save(Server.MapPath(filename));            Response.Write("创建XML文件myxml.xml成功!");        }        catch (Exception ex)        {            Response.Write(ex.Message);        }    }    /// <summary>    /// 写入XML文件    /// </summary>    /// <param name="file"></param>    public void WriteXmlFile(string file)    {        XmlDocument xmdoc = new XmlDocument();        try        {            xmdoc.Load(Server.MapPath(file));            XmlNode root = xmdoc.SelectSingleNode("Advertisements");            if (root != null)            {                XmlNode node = xmdoc.CreateNode(XmlNodeType.Element, "Ad", null);                CreateNode(xmdoc, node, "ImageUrl", "google.gif");                CreateNode(xmdoc, node, "NavigateUrl", "http://www.google.com");                CreateNode(xmdoc, node, "Impressions", "30");                CreateNode(xmdoc, node, "Keyword", "google");                root.AppendChild(node);            }            xmdoc.Save(Server.MapPath(file));            Response.Write("写入XML文件XMLFile.xml成功。<br>");        }        catch(Exception ex) {            Response.Write(ex.Message);        }    }    /// <summary>    /// 创建节点    /// </summary>    /// <param name="xmldoc"></param>    /// <param name="parentnode"></param>    /// <param name="name"></param>    /// <param name="value"></param>    public void CreateNode(XmlDocument xmldoc, XmlNode parentnode, string name, string value)    {        XmlNode node = xmldoc.CreateNode(XmlNodeType.Element, name, null);        node.InnerText = value;        parentnode.AppendChild(node);    }    /// <summary>    /// 读取XML文件    /// </summary>    /// <param name="file"></param>    private void ReadFile(string file)    {        XmlDocument xmldoc = new XmlDocument();        try        {            xmldoc.Load(Server.MapPath(file));            XmlNode node = xmldoc.SelectSingleNode("Advertisements");            if (node != null)            {                TreeNode root = new TreeNode();                root.Text = node.Name;                tvXml.Nodes.Add(root);                foreach (XmlNode xnode in xmldoc.SelectNodes("Advertisements/Ad"))                {                    TreeNode tnode = new TreeNode();                    tnode.Text = Server.HtmlEncode("<" + xnode.Name + ">");                    root.ChildNodes.Add(tnode);                        foreach (XmlNode xcnode in xnode.ChildNodes)                        {                            TreeNode tcnode = new TreeNode();                            tcnode.Text = Server.HtmlEncode("<" + xcnode.Name + ">" + xcnode.InnerText + "</" + xcnode.Name + ">");                            tnode.ChildNodes.Add(tcnode);                        }                    TreeNode ttnode = new TreeNode();                    ttnode.Text = Server.HtmlEncode("</" + xnode.Name + "");                    root.ChildNodes.Add(ttnode);                }                TreeNode tpnode = new TreeNode();                tpnode.Text = Server.HtmlEncode("</" + node.Name + ">");                tvXml.Nodes.Add(tpnode);            }        }        catch (Exception ex)        {            Response.Write(ex.Message);        }    }