Hi Terry,
Thanks for using Syncfusion proucts.
I am afraid that i am not able to reproduce the problem that you have mentioned here. Please refer to the following steps that i tried to reproduce it.
1. I have created a sample in XlsIo.
2. I have created workbook by calling the Create(count) method.
3. I have also used the Rows property to make first row to become bold.
4. It works fine here.
Please refer the below code snippet which illustrates this.
IWorkbook workbook = application.Workbooks.Create(3);
IWorksheet sheet = workbook.Worksheets[0];
sheet.Range["A1"].Text = "hello world";
sheet.Rows[0].CellStyle.Font.Bold = true;
Also i have created a simple sample to test this problem and it is available in the following link.
http://websamples.syncfusion.com/samples/XlsIO.Windows/F69485/main.htmPlease have a look at the above sample and if still the problem exists, could you please try reproducing it in the above sample or send us the reproducing steps so that we could sort out the cause of the issue and provide you a solution.
Regards,
S.Rajarajeswari