title: Using OpenOfficeXML Reference Issue
body: <p>I am trying to use <code>DocumentFormat.OpenXml</code> to export data, i have red an <a href="http://www.codeproject.com/Articles/692092/A-free-Export-to-Excel-Csharp-class-using-OpenXML" rel="nofollow noreferrer">article</a> explaining it but after adding the <code>DocumentFormat.OpenXml</code> reference it can't read the method i try to call like below</p>
  <pre><code>CreateExcelFile.CreateExcelDocument(DataSet, &quot;Test.xlsx&quot;, Response);
  </code></pre>
  <p>it's says it's missing a reference and when i looked about this i found out you need the <code>windowbase.dll</code> but it's a windows dll and i can't call it using VS.<br/>
  Should i be copy the window dll outisde in an &quot;open&quot; folder and call it? or is something i am missing?</p>