Global.asax contains the following events:
- Application_Init: Fired when an application initializes or is first called. It’s invoked for all HttpApplication object instances.
- Application_Disposed: Fired just before an application is destroyed. This is the ideal location for cleaning up previously used resources.
- Application_Error: Fired when an unhandled exception is encountered within the application.
- Application_Start: Fired when the first instance of the HttpApplication class is created. It allows you to create objects that are accessible by all HttpApplication instances.
- Application_End: Fired when the last instance of an HttpApplication class is destroyed. It’s fired only once during an application’s lifetime.
- Application_BeginRequest: Fired when an application request is received. It’s the first event fired for a request, which is often a page request (URL) that a user enters.
- Application_EndRequest: The last event fired for an application request.
- Application_PreRequestHandlerExecute: Fired before the ASP.NET page framework begins executing an event handler like a page or Web service.
- Application_PostRequestHandlerExecute: Fired when the ASP.NET page framework is finished executing an event handler.
- Applcation_PreSendRequestHeaders: Fired before the ASP.NET page framework sends HTTP headers to a requesting client (browser).
- Application_PreSendContent: Fired before the ASP.NET page framework sends content to a requesting client (browser).
- Application_AcquireRequestState: Fired when the ASP.NET page framework gets the current state (Session state) related to the current request.
- Application_ReleaseRequestState: Fired when the ASP.NET page framework completes execution of all event handlers. This results in all state modules to save their current state data.
- Application_ResolveRequestCache: Fired when the ASP.NET page framework completes an authorization request. It allows caching modules to serve the request from the cache, thus bypassing handler execution.
- Application_UpdateRequestCache: Fired when the ASP.NET page framework completes handler execution to allow caching modules to store responses to be used to handle subsequent requests.
- Application_AuthenticateRequest: Fired when the security module has established the current user’s identity as valid. At this point, the user’s credentials have been validated.
- Application_AuthorizeRequest: Fired when the security module has verified that a user can access resources.
- Session_Start: Fired when a new user visits the application Web site.
- Session_End: Fired when a user’s session times out, ends, or they leave the application Web site.
Following events are triggered one time.
- Application_Init: Triggered when application is initialized, before it’s started.
- Application_Start: Triggered when application is started.
- Session_Start: Triggered when a user enters the site.
- Session_End: Triggered when a user leaves the site.
- Application_Disposed: Triggered when application is terminated, before it’s ended.
- Application_End: Triggered when application is ended.
Events are triggered in the following order (per user’s request):
- <<code is executed>>
Mode details can be read on Working with ASP.NET Global.asax.
October 1, 2013 Update :
There is also the following Global.asax events: