I'm using this to read all values from an Excel column:

```
            Range columnToRead = ws.UsedRange.Columns[columnIndex];
            System.Array myValues = (System.Array)columnToRead.Cells.Value;
            List<String> myListValues = myValues.OfType<object>().Select(o => o.ToString()).ToList<String>();
            myListValues.RemoveAt(0);    //remove header

```

It works fine.

However I notice that empty cells are ignored/skipped. 

What should I do if I want a `""` to be added to my List when a cell is empty?