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2 users using the app simultanously; info got crossed?

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Hi,

I'm working on a MVC3 app with c#, EF, razor. It also have some web forms code as well.

We just hit an issue - 2 users are using the application simultanously, each logged in with their own credentials; somehow, it seems that a certain ID from what User A is doing got crossed to User B.

Out application logic uses a lot session variables.

So, User A will have a Session["ProductID"], with his session; and User B will have a Session["ProductID"], with a different value, for her session.

And the 2 user sessions are concurrent.

In IIS, we use a AppPool for this project, allows multi-threading.

My understanding is: User A's Session is totally separated from User B's session; so there could be many Session["ProductID"] existing at the same time, all with different values - is this correct?

If not, we have a huge issue on our hands...

Please, let me know if my understanding is correct. If not, how do we fix it?

Thanks,

Claudia


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