title: How to automatically refresh excel formulas?
body: <p>I'm experiencing big problems using ExcelPackage, because sometimes the formulas are not updated (even if I remove the value).</p>
  
  <p>I've tried using ExcelInterop to save xlsx as xls, thinking that this could resolve the issue, but it didn't.</p>
  
  <p>The way I've found to resolve it is by pressing CTRL + ALT + F9. The user will not like doing it everytime, so, I want to do it programatically. Do you know any effective way to ensure all xlsx formulas are updated?</p>