今天正式进入Routing学习...
The ASP.NET Routing module is responsible for mapping incoming browser requests to particular MVC controller actions.
读了四篇关于Routing的文章，对Routing有了一点点概念上的理解:)
ASP.NET MVC Routing Overview, http://www.asp.net/learn/mvc/tutorial-05-cs.aspx
Creating Custom Routes, http://www.asp.net/learn/mvc/tutorial-23-cs.aspx
Creating a Route Constraint, http://www.asp.net/learn/mvc/tutorial-24-cs.aspx
Creating a Custom Route Constraint, http://www.asp.net/learn/mvc/tutorial-25-cs.aspx