XML的使用

写XML：
    protected void btnSave_Click(object sender, EventArgs e)
    {
        //权限判断
        XmlTextWriter xmlw = new XmlTextWriter(Server.MapPath("~\\") + "FriendLink.xml", Encoding.GetEncoding("gb2312"));
        xmlw.Formatting = Formatting.Indented;
        xmlw.WriteStartDocument();
        xmlw.WriteStartElement("Pictures");
        string[] pic = Request.Form["picsrc"].Split(',');
        string[] url = Request.Form["urlsrc"].Split(',');
        string[] nam = Request.Form["name"].Split(',');
        int[] wh = null;
        for (int i = 0; i < 4; i++)
        {
            xmlw.WriteStartElement("picsrc");
            xmlw.WriteString(pic[i]);
            xmlw.WriteEndElement();
            xmlw.WriteStartElement("name");
            if (string.IsNullOrEmpty(nam[i]))
                xmlw.WriteString("...");
            else
                xmlw.WriteString(nam[i]);
            xmlw.WriteEndElement();
            xmlw.WriteStartElement("