title: Cant invoke Calculate method from EPPlus using C#
body: <p>I have a cell with a formula, that I need to invoke Calculate() method on, to get the result.</p>
  
  <p>Somehow I cannet invoke the Calculate method on any cells in my sheet, what am I missing?</p>
  
  <p>I am using EPPlus version 4.0.5.0.
  My code is as follows: </p>
  
  <pre><code>ws2.Cells[failedRow, failedColumn + 1].Formula = "SUM(B20:B" + (failedRow - 1) + ")";
  </code></pre>
  
  <p>And I need Calculate on that same cell. Any ideas?</p>