title: Extract column of doubles from a DataTable
body: <p>Is there an easier way to achieve the following?</p>
  
  <pre><code>var obj = from row in table.AsEnumerable()
            select row["DOUBLEVALUE"];
  
  double[] a = Array.ConvertAll&lt;object, double&gt;(obj.ToArray(), o =&gt; (double)o);
  </code></pre>
  
  <p>I'm extracting a column from a <code>DataTable</code> and storing the column in an array of <code>double</code>s.</p>
  
  <p>Assume that <code>table</code> is a <code>DataTable</code> containing a column called "DOUBLEVALUE" of type <code>typeof(Double)</code>.</p>