using System;using System.Collections.Generic;using System.Linq;using System.Text;using NPOI.HSSF.UserModel;using NPOI.POIFS.FileSystem;using NPOI.SS.UserModel;using NPOI.SS.Util;using NPOI.HSSF.Util;using NPOI.HSSF.UserModel.Contrib;using System.IO;namespace ConsoleApplication7{    class Class11    {        static void Main(string[] args)        {            HSSFWorkbook book = new HSSFWorkbook();            Sheet sheet = book.CreateSheet("bb");            FileStream fs = new FileStream(@"C:\Users\jim\Desktop\aaa\aa.xls", FileMode.OpenOrCreate);            for (int i = 0; i < 10; i++)            {                Row row = sheet.CreateRow(i);                for (int j = 0; j < 10; j++)                {                    Cell cell = row.CreateCell(j);                    cell.SetCellValue(10);                    CellStyle cs = book.CreateCellStyle();                    cs.BorderLeft = CellBorderType.THIN;                    cs.BorderBottom = CellBorderType.THIN;                    cs.BorderRight = CellBorderType.THIN;                    cs.BorderTop = CellBorderType.THIN;                    cs.FillBackgroundColor = HSSFColor.RED.index;                    cs.FillForegroundColor = HSSFColor.RED.index;                    cell.CellStyle = cs;                                    }            }            book.Write(fs);            fs.Close();        }    }}