30分钟?不需要,轻松读懂IL
http://www.cnblogs.com/brookshi/p/5225801.html
IL指令详细
http://www.cnblogs.com/zery/p/3368460.html
进阶篇:以IL为剑,直指async/await
http://www.cnblogs.com/CrabMan/p/5436083.html