New Post: Formatting cell with thousand separator

Hello

I'm trying to format NPOI cell with thousand separaror

I'm trying this but it does not change anything

        ICell Cell= dataRow.CreateCell(I);
        Cell.CellStyle.DataFormat = HSSFDataFormat.GetBuiltinFormat("#,##0");
        Cell.SetCellValue(vF); 

Do I made something wrong ?
What is the right format to get Integer with thousand separator ?


Thanks for your help