title: Select from xls file where row is not null
body: <p>While reading data from xls file, using oldedb as follows with no problem</p>
  
  <pre><code>OleDbCommand cmd = new OleDbCommand("SELECT * FROM [" + fileID + "]", oledbConn);
  DataSet ds = new DataSet();
  OleDbDataAdapter da = new OleDbDataAdapter(cmd);
  da.Fill(ds);
  </code></pre>
  
  <p>But I want to extend the select statement to only select rows of a certain column that is not null WHERE ... IS NOT NULL, what is that ... suppose to be?</p>