Hiding Rows and Columns in Worksheet

 Workbook workbook = new Workbook();

//Accessing the first worksheet in the Excel file

Worksheet worksheet = workbook.Worksheets[0];

worksheet.Cells["A1"].PutValue("1");

worksheet.Cells["A2"].PutValue("2");

worksheet.Cells["B1"].PutValue(11);

//Hiding the 1st row of the worksheet

worksheet.Cells.HideRow(0);

//Hiding the 1st column of the worksheet

worksheet.Cells.HideColumn(0);

//Saving the modified Excel file

workbook.Save("Output-HideRowsandColumns.xls");

 HSSFWorkbook hssfworkbook = new HSSFWorkbook();

ISheet s = hssfworkbook.CreateSheet("Sheet1");

IRow r1 = s.CreateRow(0);

IRow r2 = s.CreateRow(1);

//hide Row 0

r1.ZeroHeight = true;

//hide column C

s.SetColumnHidden(0, true);

FileStream file = new FileStream(@"HidingRowsandColumn(NPOI).xls", FileMode.Create);

hssfworkbook.Write(file);

file.Close();