Session_end() event is suppported by which session mode only?
The Session_End event is supported only in the InProc session state mode in ASP.NET.
InProc mode stores session data within the memory of the web server process itself. When a session expires or is abandoned, the Session_End event is triggered in the Global.asax file, allowing you to perform cleanup or execute custom logic related to the expired session.
In contrast, out-of-process session state modes such as StateServer mode and SQLServer mode do not support the Session_End event. This is because the session data is managed externally in a separate process or database, and there is no direct interaction with the web server process to raise the Session_End event when a session expires or is abandoned.
It's important to note that the Session_End event in InProc mode is not guaranteed to fire in all scenarios. For example, it may not be raised if the application pool is recycled or if the web server process terminates unexpectedly. Therefore, it's recommended to avoid relying solely on the Session_End event for critical cleanup tasks.