http://www.codeproject.com/Articles/33786/DataGridView-Filter-Popup
http://www.cnblogs.com/jaxu/archive/2011/08/04/2127365.html
http://www.360doc.com/content/12/1219/23/10939365_255194838.shtml
http://www.pin5i.com/showtopic-23492.html
原文：http://www.cnblogs.com/JustYong/p/4076984.html