using System.Xml

void page_load(object sender, System.EventArgs e){
  XmlTextWriter xmlWriter = new XmlTextWriter(Server.MapPath("XmlTextWriterWithWriteCData.xml"), null);
  // 自动格式化xml
  xmlWriter.Formatting = Formatting.Indented;
  // 写入根元素
  xmlWriter.WriteStartElement("CategoryList");
  // 写入第一个元素
  xmlWriter.WriteStartElement("Category");
  // 将元素加入类别元素
  xmlWriter.WriteElementString("MainCategory","<br>");
  // 写入CDATA
  xmlWriter.WriteCData("<br>");
  // 写入结束符
  xmlWriter.WriteEndElement();
  // 关闭writer
  xmlWriter.Close();
  Response.Write("Xml Written");
}