using System;
using System.Data;
using System.Xml;
using System.Data.SqlClient;
using System.IO;
public class TestWriteXML
{
  public static void Main()
  {
    String strFileName = c:/temp/out.xml;
    SqlConnection conn = new SqlConnection(server=localhost;uid=sa;pwd=;database=db);
    String strSql = SELECT name,age FROM people;
    SqlDataAdapter adapter = new SqlDataAdapter();
    adapter.SelectCommand = new SqlCommand(strSql, conn);
    // Build the DataSet
    DataSet ds = new DataSet();
    adapter.Fill(ds, employees);
    // Get a FileStream object
    FileStream fs = new FileStream(strFileName, FileMode.OpenOrCreate, FileAccess.Write);
    // Apply the WriteXml method to write an XML document
    ds.WriteXml(fs);
    fs.Close();
  }
}