Executes final cleanup code before the System.Web.SessionState.SessionStateModule object is released from memory.
This method is not intended to be called from application code.
An System.Web.HttpApplication object is created when an ASP.NET application is started. The System.Web.HttpApplication object creates and initializes the System.Web.SessionState.SessionStateModule object for the application and calls the SessionStateModule.Dispose method when the object is released. The System.Web.SessionState.SessionStateModule is specified in the configuration for an application.