how to generate a xml from a dataset?

protected void Page_Load(object sender, EventArgs e)
{
  string connectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\\Documents and Settings\\abc\\My Documents\\Visual Studio 2005\\WebSites\\test\\App_Data\\test.mdb";
  OleDbConnection con = new OleDbConnection(connectionString);
  DataTable dt = new DataTable();
  //creating new connection to database Employee
  con.Open();
  //opening connection
  //assigning data to DataAdapter according to the query
  OleDbDataAdapter adpt = new OleDbDataAdapter("select * from emp", con);
  //filling dataset.
  adpt.Fill(dt);
  dt.WriteXml("test.xml");
  con.Close();
}