Currently, only Workbook/Worksheet could be protected. Would be nice to expose a way to protect cells for scenarios in which only particular cells should be locked for modifications.
This scenario can be implemented by setting IsLocked to all columns to false and set the same property to the cells you want to lock to true: worksheet.Columns[0, SpreadsheetDefaultValues.ColumnCount - 1].SetIsLocked(false); worksheet.Cells[0, 0].SetIsLocked(true);