title: find out if there are hidden columns in excel
body: <p>I need to know if there hidden columns in the excel sheet.</p>
  
  <p>i used use the following  which worked fine and then suddenly it stopped working.now it always returns false.</p>
  
  <pre><code>bool.Parse(worksheet.PageSetup.Application.Columns.Hidden.ToString())
  </code></pre>
  
  <p>TIA
  excel 2007
  .net 3.5</p>