title: How to Update external links in Excel using OpenXML
body: <p>I have a workbook with a couple of external links. 
  Regularly we need to update the links to point to a new excel database, so I'm making a small windows application to do it automatically. </p>
  
  <p>I'm trying to use OpenXML to get this done. I dont want to use Interop, coz it takes too long to open the file, change the link and then close the workbooks again. </p>
  
  <p>Any Ideas , please let me know. I'm open to using ClosedXML to this as well. </p>