使用XlmWrite把一个xml文件写入输出流中。在（demo2.aspx运行时显示xml文档）

********************************Demo2.aspx

<%@ Page Xlanguage="C#" AutoEventWireup="true" CodeBehind="Demo2.aspx.cs" Inherits="XML.Demo2" %>

********************************Demo2.aspx.cs

protected void Page_Load(object sender, EventArgs e)
        {
            XmlWriterSettings settings = new XmlWriterSettings();
            settings.Encoding = System.Text.Encoding.UTF8;//编码
            settings.Indent = true;
            using (XmlWriter write = XmlWriter.Create(this.Response.Output, settings))
            {
                write.WriteStartDocument();
                write.WriteStartElement("books");
                write.WriteStartElement("book");                write.WriteStartAttribute("id");
                write.WriteValue("1");
                write.WriteEndAttribute();

                write.WriteStartElement("author");
                write.WriteString("乔布斯");

                write.WriteEndElement();

                write.WriteEndElement();

                write.WriteStartElement("book");
                write.WriteStartElement("publisher");
                write.WriteString("清华大学出版社");
                write.WriteEndElement();
                write.WriteEndElement();

                write.WriteEndElement();

            }

        }