///XML文件内容：

<root>
  <METADATA>
    <AUTHOR>111111</AUTHOR>
    <GENERATOR>1111111</GENERATOR>
    <PAGETYPE>111111</PAGETYPE>
    <ABSTRACT>Specifies a data island</ABSTRACT>
  </METADATA>
  <METADATA>
    <AUTHOR>John Smith2</AUTHOR>
    <GENERATOR>Visual Notepad2</GENERATOR>
    <PAGETYPE>Reference2</PAGETYPE>
    <ABSTRACT>Specifies a data island2</ABSTRACT>
  </METADATA>
  <METADATA>
    <AUTHOR>John Smith3</AUTHOR>
    <GENERATOR>Visual Notepad3</GENERATOR>
    <PAGETYPE>Reference3</PAGETYPE>
    <ABSTRACT>Specifies a data island3</ABSTRACT>
  </METADATA>
</root>

　　///从XML文件读XML数据到页面：

        DataSet strxml = new DataSet();
        string path = “xmlDatal.xml”;
        strxml.ReadXml(Server.MapPath(path));
        this.TextBox1.Text = strxml.Tables[0].Rows[0][“AUTHOR”].ToString();
        this.TextBox2.Text = strxml.Tables[0].Rows[0][“GENERATOR”].ToString();
        this.TextBox3.Text = strxml.Tables[0].Rows[0][“PAGETYPE”].ToString();
        this.TextBox4.Text = strxml.Tables[0].Rows[0][“ABSTRACT”].ToString();

 　　///修改XML文件中节点内容：

        XmlDocument xmlDoc = new XmlDocument();
        string path = “xmlDatal.xml”;
        xmlDoc.Load(Server.MapPath(path));
        XmlNode str1 = xmlDoc.selectSingleNode(“/root/METADATA/AUTHOR”);
        str1.InnerText = this.TextBox1.Text.Trim();
        XmlNode str2 = xmlDoc.selectSingleNode(“/root/METADATA/GENERATOR”);
        str2.InnerText = this.TextBox2.Text.Trim();
        XmlNode str3 = xmlDoc.selectSingleNode(“/root/METADATA/PAGETYPE”);
        str3.InnerText = this.TextBox3.Text.Trim();
        XmlNode str4 = xmlDoc.selectSingleNode(“/root/METADATA/ABSTRACT”);
        str4.InnerText = this.TextBox4.Text.Trim();
        xmlDoc.Save(Server.MapPath(path));

 　　///在XML文件中添加一条XML数据：

　　///方法一:使用DS操作XML文件

        String fileName = “xmlDatal.xml”;
        DataSet myDs = new DataSet();
        try
        {

　　       FileStream fileIn;
            fileIn = new FileStream(Server.MapPath(fileName), FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
            myDs.ReadXml(fileIn);
            fileIn.Close();
        }
        catch (Exception ex)
        {
            Response.Write(ex.Message);
        }
        //给当前DS中增加新行

        DataRow newRow = myDs.Tables[0].NewRow();
        newRow[“AUTHOR”] = this.TextBox1.Text.Trim().ToString();
        newRow[“GENERATOR”] = this.TextBox2.Text.Trim().ToString();
        newRow[“PAGETYPE”] = this.TextBox3.Text.Trim().ToString();
        newRow[“ABSTRACT”] = this.TextBox4.Text.Trim().ToString();
        myDs.Tables[0].Rows.Add(newRow);

        //将myDs的改变写入XML
        try
        {
            FileStream fileOut;
            fileOut = new FileStream(Server.MapPath(fileName), FileMode.Open, FileAccess.Write, FileShare.ReadWrite);
            myDs.WriteXml(fileOut, XmlWriteMode.WriteSchema);
            fileOut.Close();
        }
        catch (Exception ex)
        {
            Response.Write(ex.Message);
        }

　　///方法二:使用XmlDocument写入一笔XML记录

        String fileName = “xmlDatal.xml”;
        try
        {
            //先建立一个XML DOM
            XmlDocument doc = new XmlDocument();

            //读入XML文件
            doc.Load(Server.MapPath(fileName));

            //建立一个节点。
            XmlElement METADATA = doc.createElement(“METADATA”);

            //建立一个属性，并将次属性放置在接点 “newUser” 下
            XmlAttribute newID = doc.createAttribute(“id”);
            newID.InnerText = “3”;
            METADATA.SetAttributeNode(newID);

            //建立一个节点，并将此做为“METADATA”的子节点
            XmlElement AUTHOR = doc.createElement(“AUTHOR”);
            AUTHOR.InnerText = this.TextBox1.Text.Trim().ToString();
            METADATA.AppendChild(AUTHOR);

             //建立一个节点，并将此做为“METADATA”的子节点
            XmlElement GENERATOR = doc.createElement(“GENERATOR”);
            GENERATOR.InnerText = this.TextBox2.Text.Trim().ToString();
            METADATA.AppendChild(GENERATOR);

             //建立一个节点，并将此做为“METADATA”的子节点
            XmlElement PAGETYPE = doc.createElement(“PAGETYPE”);
            PAGETYPE.InnerText = this.TextBox3.Text.Trim().ToString();
            METADATA.AppendChild(PAGETYPE);

             //建立一个节点，并将此做为“METADATA”的子节点
            XmlElement ABSTRACT = doc.createElement(“ABSTRACT”);
            ABSTRACT.InnerText = this.TextBox4.Text.Trim().ToString();
            METADATA.AppendChild(ABSTRACT);

            //将节点“newUser”放在根节点下，并保存
            doc.DocumentElement.AppendChild(METADATA);
            doc.Save(Server.MapPath(fileName));    //我的文件是放在同目录文件夹下的
        }
        catch (Exception ex)
        {
            Response.Write(ex.Message);
        }
        finally
        {
        }
　　所有代码都通过调试~~