using (FileStream fs = File.OpenRead(@"E:\a.xls"))   //打开myxls.xls文件

            {

                HSSFWorkbook wk = new HSSFWorkbook(fs);   //把xls文件中的数据写入wk中

                wk.RemoveSheetAt(0);

 

                using (FileStream fileHSSF = new FileStream(@"E:\a.xls", FileMode.Create))

                {

                    wk.Write(fileHSSF);

                    fileHSSF.Close();

                }

                wk.Close();

                fs.Close();

            }