Hi Terry,
On further investigation, I found a way to allow both formatting of columns and rows when the sheet is protected. Please refer the following code snippet to achieve this:
//Protect sheet.
sheet.Protect("syncfusion", ExcelSheetProtection.FormattingColumns|ExcelSheetProtection.FormattingRows);
Here is the sample for your reference:
http://websamples.syncfusion.com/samples/XlsIO.Windows/F51455_1/main.htmKindly let me know if you have any other questions.
Thanks,
Melba