public void ExportToExcelTwo(System.Data.DataTable dt, string colTitle, string filePath)        {            HSSFWorkbook workBook = new HSSFWorkbook();            HSSFSheet sheet = (HSSFSheet)workBook.CreateSheet("sheet1");            HSSFRow row1 = (HSSFRow)sheet.CreateRow(0);            string[] titles = colTitle.Split(‘,‘);            for (int i = 0; i < titles.Length; i++)            {                HSSFCell cell = (HSSFCell)row1.CreateCell(i, CellType.STRING);                cell.SetCellValue(titles[i]);            }            for (int j = 0; j < dt.Rows.Count; j++)            {                HSSFRow rows = (HSSFRow)sheet.CreateRow(j + 1);                for (int k = 0; k < dt.Columns.Count; k++)                {                    HSSFCell cells = (HSSFCell)rows.CreateCell(k);                    cells.SetCellValue(dt.Rows[j][k].ToString());                }            }            using (FileStream fs = new FileStream(filePath, FileMode.OpenOrCreate))            {                workBook.Write(fs);            }            GC.Collect();        }