CODEWITHSUNDEEP
asp.netsession
Sameers Javed
Sameers Javed

Reputation: 352

ASP.NET session gets null unexpectly

I have a simple scenario. in one page of asp.net, I store a some values in session like

session("var") = "some string" or session("var1") = object of generic list of string

and then use response.redirect to goto another page. on other page it shows things fine, but when we press a button to do an action on it, session gets null.

Remember, it doesn't always happen. Just sometimes it does so and other times it works fine. We do this practice a lot to move some values from page to page (by storing them into session and goto other page). We have very big application and all works fine, but from some days, have been having this issue on some sites with some users. Once again, it doesn't always happen. 99% it works fine but few times, we have this issue where session variable is no longer available.

Is there any way to know what is going wrong and where? We do store some other variables in the session as well, they seems fine at that time. only some of the session variables lose their values.

From my research, it seems people blames on the IIS worker process restart or Application Pool recycle. But I believe in such case all the session variables in the application must be voided, not selected few. Right?

also, is there any way to know in code if the pool or worker process was restarted?

thanks Sameers

Upvotes: 1

Views: 648

Answers (1)

Luaan
Luaan

Reputation: 63722

Perhaps you're passing domain boundaries. Session is identified by a client cookie, which are usually stored on a per-domain basis. So, for example, a redirect from www.whatever.com to client.whatever.com will cause you to lose the session ID, which will appear to you as "voiding the session". So, be careful about sub-domains too. Going from whatever.com to www.whatever.com is fine, but the other way round, nope.

And yes, unless you're on a web farm IIS, restarting the worker process will kill all the sessions. Unless you store them in a database or something.

Upvotes: 1

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