C# lectura access y escritura xml

OleDbConnection con = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=o:\\datos\\datos.mdb;Jet OLEDB:Database Password =****");
  OleDbCommand cmd = new OleDbCommand("select * from departamento",con);
  XmlTextWriter xmlwriter = new XmlTextWriter(@"d:\pub\web\datos.xml",null);
  xmlwriter.Formatting = Formatting.Indented;
  xmlwriter.IndentChar = '\t';
  xmlwriter.Indentation = 1;
  xmlwriter.WriteStartElement("Datos");
  xmlwriter.WriteStartElement("Departamentos");
  con.Open();
  try
  {
   dr = cmd.ExecuteReader();
   while (dr.Read())
   {
    xmlwriter.WriteStartElement("Departamento");
    xmlwriter.WriteString(dr["Nomb"].ToString());
    xmlwriter.WriteEndElement();
   }
  }
  finally
  {
   xmlwriter.WriteEndElement();
   xmlwriter.WriteEndElement();
   con.Close();
   xmlwriter.Close();
  }