C# npoi插入(或者说添加新增)一个新的sheet

Question

一个excel有三个sheet用nopi如何做..........如果
HSSFWorkbook hssfworkbook = new HSSFWorkbook();
ISheet sheet = hssfworkbook.CreateSheet(str_SheetName);
using (FileStream fs = new FileStream(str_Path, FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite))
{
hssfworkbook.Write(fs);
}
结果是只剩下新建的表
求大牛们指出我的错处并指导

Answer 1

http://www.cnblogs.com/dyllove98/archive/2013/08/06/3241515.html