Will my session state be saved when my page hit an error? Will my session state be saved when my page hit an error? In Session_End, I tried to do some cleanup job using SQL but it failed. Why?

Platform: ASP.NET| Category: Session

Session_End is supported only in InProc mode.
Session_End is run using the account which runs the worker process (aspnet_wp.exe), which can be specified in machine.config. Therefore, in your Session_End, if you connect to SQL using integrated security, it will use that worker process account credential to connect, and may fail depending on your SQL security settings.