title: asp.net ListView sorting arrows
body: <p>How to go about adding one arrow image (up or down) to a list view's header so that when you click on it it sorts the column by ascending/descending order?</p>
  
  <p>Currently I just have a link that does the sorting:</p>
  
  <pre><code>&lt;asp:LinkButton runat="server" ID="sortPosition" CommandName="Sort" CommandArgument="Position" &gt;Position&lt;/asp:LinkButton&gt;
  </code></pre>