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What are major events in GLOBAL.ASAX file ?

Posted By:Shashi Ray       Posted Date: March 20, 2009    Points: 25    Category: ASP.NET    URL: http://www.dotnetspark.com  


The Global.asax file, which is derived from the HttpApplication class, maintains a pool

of HttpApplication objects, and assigns them to applications as needed. The Global.asax file contains the following events:


Application_Init: Fired when an application initializes or is first called. It is 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_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 is fired only once during an application's lifetime.


Application_BeginRequest: Fired when an application request is received. It is 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 has 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 send 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.



Shashi Ray

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