title: How can I set UsedRange of a sheet only for cells that contain an active value?
body: <p>Is there something similar to UsedRange property of Microsoft.Office.Interop.Excel.Worksheet that only loops through the range that contains an active value e.g. cell is not empty?</p>
  <p>Now it loops through all the cells that have been modified in any way in the past and it is taking too much time.</p>