title: Is it possible to read the excel cell value with formula?
body: <p>In my following code, the value of c4 is coming out zero. C4 cell has formula SUM(C2:C3). 
  Is EPPlus capable of reading cell with formula? Why is c4 being set to zero instead of 12.</p>
  
  <pre><code>using (var package = new ExcelPackage(existingFile))
  {
      ExcelWorkbook workBook = package.Workbook;
      var currentWorksheet = workBook.Worksheets.First();
  
      currentWorksheet.Cells["C2"].Value = 5;
      currentWorksheet.Cells["C3"].Value = 7;
      var c4 = Convert.ToDouble(currentWorksheet.Cells["C4"].Value); //c4 is zero. why?
  }
  </code></pre>