//DataTable DateSet 都可以用来读取xml数据和写入xml数据
protected voidButton1_Click(object sender, EventArgs e)
{
  DataTabledt = new DataTable(\"Employee\");
  DataColumndcID = new DataColumn(\"ID\", typeof(string));
  DataColumndcName = new DataColumn(\"NAME\", typeof(string));
  DataColumndcAGE = new DataColumn(\"AGE\", typeof(string));
  DataColumndcDEPT = new DataColumn(\"DEPT\", typeof(string));
  dt.Columns.AddRange(new DataColumn[] {dcID, dcName, dcAGE, dcDEPT });
  DataRowdr = dt.NewRow();
  dr[\"ID\"]= \"3\";
  dr[\"NAME\"]= \"chen\";
  dr[\"AGE\"]= \"21\";
  dr[\"DEPT\"]= \"技术部\";
  dt.Rows.Add(dr);
  DataSetds2 = new DataSet();
  ds2.Tables.Add(dt);
  DataSetds = new DataSet();
  ds.ReadXml(Server.MapPath(\"Employee.xml\"));
  ds.Merge(ds2);//合并数据
  ds.WriteXml(Server.MapPath(\"Employee.xml\"));
  Page.ClientScript.RegisterStartupScript(GetType(), \"\", \"alert(\'写入成功\')\",true);
}
protected voidButton2_Click(object sender, EventArgs e)
{
  DataSetds = new DataSet();
  ds.ReadXml(Server.MapPath(\"Employee.xml\"));
  GridView1.DataSource = ds;
  GridView1.DataBind();
}