Actual syntax should be like below. But both of these syntax doesn't works sometime
font.Boldweight = FontBoldWeight.Bold ;
font.Boldweight = (short)FontBoldWeight.Bold;
FontBoldWeight is type enum, which after type casting may not work sometime. As a workaround if you type caste or use actual short value of enum directly, it works. Below is the declaration of FontBoldWeight. it will make things clear.
**public enum FontBoldWeight
None = 0,
Normal = 400,
Bold = 700,
Seems that the Ernie Banzon answer no longer works exactly as described, possibly due to a namespace change (or in fact that I'm using the HSSF namespace?)
// usings
using NPOI.HSSF.UserModel;
// IWorkbook doc
IFont font = doc.CreateFont();
font.FontHeightInPoints = 11;
font.FontName = "Arial";
font.Boldweight = (short)FontBoldWeight.BOLD;
var font = reportWorkbook.CreateFont();
font.FontHeightInPoints = 11;
font.FontName = "Calibri";
font.Boldweight = (short)NPOI.SS.UserModel.FontBoldWeight.BOLD;
var cell = headerRow.CreateCell(0);
cell.SetCellValue("Test Bold");
cell.CellStyle = reportWorkbook.CreateCellStyle();
cell.CellStyle.SetFont(font);
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