如何获取哪个页面在aspx中向Application_error抛出异常

I have a general exception handler, Application_error in my global.asax where I'm trying to isolate all the uncaught exceptions on all my many pages. I don't want to use Page_error to catch exception because it's inefficient to call that on so many pages. So where in the exception can I find what page actually caused the exception?I have a general exception handler, Application