What is the purpose of global asax in asp net

Question

How can we use global asax in asp net  And what is that

User · Answer

The Global asax file  also known as   the ASP NET application file  is an   optional file that contains code for   responding to application-level and   session-level events raised by ASP NET   or by HTTP modules    http   msdn microsoft com en-us library 2027ewzw aspx

User · Answer

MSDN has an outline of the purpose of the global asax file   Effectively  global asax allows you to write code that runs in response to  system level  events  such as the application starting  a session ending  an application error occuring  without having to try and shoe-horn that code into each and every page of your site   You can use it by by choosing Add   New Item   Global Application Class in Visual Studio  Once you ve added the file  you can add code under any of the events that are listed  and created by default  at least in Visual Studio 2008     Application Start  Application End Session Start  Session End Application BeginRequest Application AuthenticateRequest Application Error   There are other events that you can also hook into  such as  LogRequest

User · Answer

The Global asax can be used to handle events arising from the application  This link provides a good explanation  http   aspalliance com 1114

User · Answer

Global asax is the asp net application file   It is an optional file that handles events raised by ASP NET or by HttpModules  Mostly used for application and session start end events and for global error handling   When used  it should be in the root of the website

User · Answer

Global asax events explained  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

User · Answer

The root directory of a web application has a special significance and certain content can be present on in that folder  It can have a special file called as    Global asax     ASP Net framework uses the content in the global asax and creates a class at runtime which is inherited from HttpApplication  During the lifetime of an application  ASP NET maintains a pool of Global asax derived HttpApplication instances  When an application receives an http request  the ASP Net page framework assigns one of these instances to process that request  That instance is responsible for managing the entire lifetime of the request it is assigned to and the instance can only be reused after the request has been completed when it is returned to the pool  The instance members in Global asax cannot be used for sharing data across requests but static member can be  Global asax can contain the event handlers of HttpApplication object and some other important methods which would execute at various points in a web application

[c#] What is the purpose of global.asax in asp.net

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