组件类与普通类的区别
http://blog.csdn.net/CYSONG168/archive/2010/07/24/5761906.aspx
Component,Container,IServceContainer,ISite 使用初探
http://blog.csdn.net/daizhj/archive/2006/12/20/4614265.aspx
类，组件、控件
http://msdn.microsoft.com/zh-cn/library/0b1dk63b(v=VS.90).aspx
