Hi,

I'm not sure if I fully understand your question, so please correct me if
I've misunderstood anything.

Please refer to ASP.NET Page Life Cycle Overview below for more information
on when you can add states to session:

#ASP.NET Page Life Cycle Overview
http://msdn2.microsoft.com/en-us/library/ms178472.aspx

Sincerely,
Walter Wang (wawang@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

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can be done with a inproc session. default needs to add a container
object to session that will hold all the new objects. default then
creates a new thread to do the background processing and passes a
reference to the container. the background thread fills the container.
you will have to implement thread locking for the container.

-- bruce (sqlwork.com)