Why isn’t session state available?

Platform: ASP.NET| Category: Session

– First, check your web.config, machine.config and your page directive to make sure you have enabled session state.
Reference:
- Session State
- @ Page
– session state is not available just everywhere, anytime. It is available only after the HttpApplication.AcquireRequestState event is called. For example, it is NOT available in the Application_OnAuthenticateRequest handler inside global.asax.
For details, see: Handling Public Events
– Lastly, make sure System.Web.SessionState.SessionStateModule is included the in your config files. A common case is that SharePoint application will remove this module from their web.config files (for performance reason), and thus session state isn’t available.

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