title: SqlDataReader GetOrdinal with same name
body: <p>is need to use <code>GetOrdinal</code> from the <code>SqlDataReader</code> but my query is with joins and contains the same field name multiple times.
  So I try</p>
  
  <pre><code>SELECT a.Id, b.Id FROM table1 AS a ...
  </code></pre>
  
  <p>but GetOrdinal seems don<code>t understand the schema alias...</code>GetOrdinal('a.Id')`
  throws an Exception... is there anyway to archive this?</p>