Event Name	Description
Application_AuthenticateRequest	Get called before the user credentials are authenticated.
Application_AuthorizeRequest()	Get called on successful authentication of the user's credentials.
Application_BeginRequest()	Get called when there is a request for the web application.
Application_ResolveRequestCache()	Get called on successful completion of an authorization request.
Application_AcquireRequestState()	Get called just before the session state is retrieved for the current request.
Application_PreRequestHandlerExecute()	Get called before the page framework begins before executing an event handler to handle the request.
Application_PostRequestHandlerExecute()	Get called after HTTP handler has executed the request.
Application_ReleaseRequestState()	Get called before current state information kept in the session collection is serialized.
Application_UpdateRequestCache()	Get called before data is added to the output cache of the page.
Application_EndRequest()	Get called at the end of each request

Methods corresponding to events that do not fire on each request

Event Name	Description
Application_Start()	Get called when the first resource is requested from the server.
Session_Start()	Get called when the session starts new user requesting a page.
Application_Error()	Get called when an exception occurs.
Session_End()	Get called when the user session ends.
Application_End()	Get called when the application ends.
Application_Disposed()	Get called when the application is destroyed.

Using the Global.asax File