public static int GetCellIntValue(this ISheet sheet, int rowIndex, int colIndex, int defaultValue = 0)
        {
            var cell = new WorkbookCell {
                RowIndex = rowIndex, ColIndex = colIndex
            };

            return(GetCellIntValue(sheet, cell, defaultValue));
        }
        public static int GetCellIntValue(this ISheet sheet, WorkbookCell cellIndex, int defaultValue = 0)
        {
            var cell = sheet.GetRow(cellIndex.RowIndex).GetCell(cellIndex.ColIndex);

            return(cell != null && cell.CellType != CellType.Blank
                ? (int)cell.NumericCellValue
                : defaultValue);
        }