public static void SaveAsExcel(string sCSVFile, string sExcelFile)
        {
            Workbooks excelWorkBooks = null;
            Workbook excelWorkBook = null;

            Application app = new Application();
            app.Visible = false;
            app.DisplayAlerts = false;
            excelWorkBooks = app.Workbooks;
            excelWorkBook = ((Workbook)excelWorkBooks.Open(sCSVFile, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value));

            log.InfoFormat("excel path is :{0}", sExcelFile);
            excelWorkBook.SaveAs(sExcelFile, XlFileFormat.xlAddIn8, Missing.Value, Missing.Value, Missing.Value, Missing.Value, XlSaveAsAccessMode.xlNoChange, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value);
            excelWorkBook.Close();
            app.Quit();
        }
        //private string GetDescription(int sampleID)
        //{
        //    int sampleIndex = sampleID - 1;
        //    int colIndex = sampleIndex / 8;
        //    int rowIndex = sampleIndex - colIndex * 8;
        //    return string.Format("{0}{1:D2}", (char)('A' + rowIndex), colIndex + 1);
        //}
        private void SaveAsCSV(List<string> sheetPaths)
        {
            Application app = new Application();
            app.Visible = false;
            app.DisplayAlerts = false;
            foreach (string sheetPath in sheetPaths)
            {

                string sWithoutSuffix = "";
                int pos = sheetPath.IndexOf(".xls");
                if (pos == -1)
                    throw new Exception("Cannot find xls in file name!");
                sWithoutSuffix = sheetPath.Substring(0, pos);
                string sCSVFile = sWithoutSuffix + ".csv";
                if (File.Exists(sCSVFile))
                    continue;
                sCSVFile = sCSVFile.Replace("\\\\", "\\");
                Workbook wbWorkbook = app.Workbooks.Open(sheetPath);
                wbWorkbook.SaveAs(sCSVFile, XlFileFormat.xlCSV);
                wbWorkbook.Close();
                Console.WriteLine(sCSVFile);
            }
            app.Quit();
        }