private static void CreateHeader(IRow row, List<string> header)
{

    HSSFWorkbook wb = new HSSFWorkbook();

    ISheet sheet = wb.CreateSheet("Modelo");

    ICellStyle style = wb.CreateCellStyle();

    IRow row = row.CreateRow(0);

    for (int i = 0; i < header.Count; i++)
    {
        ICell cell = row.CreateCell(i);

        cell.SetCellValue(header[i]);

        cell.CellStyle = style;
    }
}