XML Doc - null handling
<p>I have </p>

<pre><code>xmlDoc.DataSet.Tables["&lt;tablename&gt;"].Columns
</code></pre>

<p>I want to loop through those columns via <code>DataColumn</code>, for say this <code>xmlDoc</code> has 10 entries and 5 are null, then the loop should happen for the non-null entries only.</p>

<p>Any thoughts?</p>
