The Best Way to Learn ASP.NET

http://net.tutsplus.com/tutorials/asp-net/the-best-way-to-learn-asp-net/

What is IoC

http://martinfowler.com/articles/injection.html#InversionOfControl

The Downsides of ASP.NET Session State

http://tech-journals.com/jonow/2011/10/22/the-downsides-of-asp-net-session-state

by default the ASP.NET pipeline will not process requests belonging to the same session concurrently. It serialises them, i.e. it queues them in the order that they were received so that they are processed serially rather than in parallel. 

When does Application_Start get called in ASP.NET?

First time running
Or
Web.config was changed

The Dangers of Implementing Recurring Background Tasks In ASP.NET

http://haacked.com/archive/2011/10/16/the-dangers-of-implementing-recurring-background-tasks-in-asp-net.aspx