title: How to add ExcelPackage reference in C#
body: <p>Please help me: how to add reference for <code>ExcelPackage</code>?</p>
  
  <p>In the following line</p>
  
  <pre><code>using (var excel = new ExcelPackage(FileUpload1.PostedFile.InputStream))
  </code></pre>
  
  <p>I'm getting this error:</p>
  
  <blockquote>
    <p>The type or namespace name 'ExcelPackage' could not be found (are you missing a using directive or an assembly reference?)</p>
  </blockquote>
  
  <p>I have already called <code>Install-Package DocumentFormat.OpenXml</code> </p>