.Net Profiler - Choosing Entry Function and Exit function of a Request

Hi,

I need to choose the entry point function and exit function point of a .Net web application . What is the correct entry point of the function which should be common to both Classic and Integrated pipeline mode. 

The entry point and exit point should have the HttpContext.Current Object initialized. 

I choosed "System.Web.Hosting.PipelineRuntime:ProcessRequestNotification" as entry point and "FinishPipelineRequest" as exit point. But, for one single request  the entry point is getting called four times. And the ProcessRequestNotification does not present in "Classic" mode of pipeline request. 

So what should i choose as a better entry and exit point functions .?

Thanks 

./Selva