title: Reader is empty
body: <p>I have a data reader that gets empty results but I don't get why? </p>
  
  <p>My connection state is open, i tested my query in my DB, it returns values but there my <code>reader.read()</code> just get skipped</p>
  
  <pre><code>OdbcDataReader Reader;
  string mond = "select fir_mdnt from safir JOIN safirbpv ON firbpv_fir = fir_fir where firbpv_ibnr = '" + _cb_Compte.SelectedItem + "' group by fir_mdnt;";
  OdbcCommand mondant = new OdbcCommand(mond, InfoConnexion);
  
  InfoConnexion.Open();
  Reader = mondant.ExecuteReader();
  while (Reader.Read())
  {
      MessageBox.Show(Reader.ToString());
  }
  InfoConnexion.Close();
  </code></pre>