NOPI好像比较好用对WINFORM支持更好！

http://www.cnblogs.com/dreamof/archive/2010/06/02/1750151.html

NOPI教程 http://tonyqus.sinaapp.com/npoi2tutorial

http://www.cnblogs.com/liudeyun/p/3535740.html

C# Excel或表格插件