HttpContext is closely related to threads…

but not exactly

http://odetocode.com/Articles/112.aspx

“The CallContext provides a service extremely similar to thread local storage (except CallContext can perform some additional magic during a remoting call). Thread local storage is a concept where each logical thread in an application domain has a unique data slot to keep data specific to itself. Threads do not share the data, and one thread cannot modify the data local to a different thread. ASP.NET, after selecting a thread to execute an incoming request, stores a reference to the current request context in the thread’s local storage. Now, no matter where the thread goes while executing (a business object, a data access object), the context is nearby and easily retrieved.”

 

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