using ...System; 
using System.Xml; 
public partial class _Default : System.Web.UI.Page ...{ 
protected void Button1_Click(object sender, EventArgs e) 
...{ XmlTextWriter writer = null; try ...{ writer = new XmlTextWriter(Server.MapPath("First.xml"),System.Text.Encoding.UTF8); writer.Formatting = Formatting.Indented; writer.WriteStartDocument(); writer.WriteStartElement("Teachers"); writer.WriteStartElement("Teacher"); writer.WriteAttributeString("number","firstone"); writer.WriteElementString("name","John"); writer.WriteElementString("Nianling","12"); writer.WriteElementString("sex","woman"); writer.WriteStartElement("xueli", "gao"); writer.WriteAttributeString("ninn", "11212"); writer.WriteEndElement(); writer.WriteElementString("xueke", "shuxue"); writer.WriteEndElement(); writer.WriteEndElement(); 
} finally ...{ if (writer != null) writer.Close(); } } }