FileHelpers.ExcelNPOIStorage.ExcelNPOIStorage.AddHeaderColumns C# (CSharp) Method

        private void AddHeaderColumns(int startCol,int rowNum)
        {
            if (ColumnsHeaders.Count != 0)
            {
                if (mSheet == null)
                    return;

                var row = mSheet.GetRow(rowNum);
                if (row == null)
                    row = mSheet.CreateRow(rowNum);
                for (int i = 0; i <= startCol + ColumnsHeaders.ToArray().Length; i++)
                {
                    var cell = row.GetCell(i);
                    if (cell == null)
                        row.CreateCell(i);
                }

                CellRangeAddress range = new CellRangeAddress(StartRow == 0
                        ? 0
                        : StartRow, StartRow == 0
                        ? 0
                        : StartRow, startCol, startCol + ColumnsHeaders.ToArray().Length - 1);

                CellWalk cw = new CellWalk(mSheet, range);
                cw.SetTraverseEmptyCells(true);

                CellInserter ci = new CellInserter(new List<object>(ColumnsHeaders));

                cw.Traverse(ci);
            }
        }