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What event handlers can I include in Global.asax?

Posted By :Jegan R     Posted Date :November 02, 2010    Points :10   Category :ASP.Net 
Application_Start,Application_End, Application_AcquireRequestState, Application_AuthenticateRequest, Application_AuthorizeRequest, Application_BeginRequest, Application_Disposed, Application_EndRequest, Application_Error, Application_PostRequestHandlerExecute, Application_PreRequestHandlerExecute,
Application_PreSendRequestContent, Application_PreSendRequestHeaders, Application_ReleaseRequestState, Application_ResolveRequestCache, Application_UpdateRequestCache, Session_Start,Session_End
You can optionally include "On" in any of method names. For example, you can name a BeginRequest event handler.Application_BeginRequest or Application_OnBeginRequest.You can also include event handlers in Global.asax for events fired by custom HTTP modules.Note that not all of the event handlers make sense for Web Services (they're designed for ASP.NET applications in general, whereas .NET XML Web Services are specialized instances of an ASP.NET app). For example, the Application_AuthenticateRequest and Application_AuthorizeRequest events are designed to be used with ASP.NET Forms authentication.


You can also find related Interview Question to What event handlers can I include in Global.asax?  below: 

List the event handlers that can be included in Global.asax?

  
o Application start and end event handlers
o Session start and end event handlers
o Per-request event handlers
o Non-deterministic event handlers (More...)

Why is Global.asax is used for ?

  
Global.asax is used To implement application & Session level events (More...)

How many event handlers in sharepoint?

  
1.SPItemEventReceiver
2.SPListEventReceiver
3.SPWebEventReceiver
(More...)

Difference Between Web.Config file and Global.asax ?

  
Web.Config file is used ....

1. To specify the application settings
2. To specify the session mechanism available to use for that application.
3. To Specify the Connection strings.
4. To Specify the authentication and authorization.
5. To Specify the http handlers.
6. To Specify different providers.

Global.asax file is used to specify the session and application event handlers.
(More...)

List major events in GLOBAL.ASAX file ?

  
Application_Init:
Application_Disposed:
Application_Error:
Application_Start:
Application_End:
Application_BeginRequest:
Application_EndRequest:
Application_PreRequestHandlerExecute:
Application_PostRequestHandlerExecute:
Applcation_PreSendRequestHeaders:
Application_PreSendContent:
Application_AcquireRequestState:
Application_ReleaseRequestState:
Application_ResolveRequestCache:
thus bypassing handler execution.
Application_UpdateRequestCache:
Application_AuthenticateRequest:
Application_AuthorizeRequest:
Session_Start:
Session_End:
Web site. (More...)

What's the significance of "GLOBAL.ASAX" file ?

  
GLOBAL.ASAX allows us to executing ASP.NET application level events and setting application-level variables. (More...)

What is Global.asax used for?

  
implement application and session level events. (More...)

What is the difference between web.config and global.asax?

  
web.config:- It is a xml based file.
glbal.asax:- It is class file.

web.config:- It carries configuration data of the ASP.Net website.
global.asax:- It carries application events of the ASP.Net website.

web.config:- If there will be any change made on this file, we need to just save the new file with the ASP.Net website.
global.asax:- If there will be any change made on this file, we need to compile/rebuild the ASP.Net website. (More...)

What are the base classes, event handlers can inherit.

  
While developing event handlers there are several base classes from which you can inherit.

SPItemEventReciever: One must inherit from this base class if you want the event handler to be executed when the item is added,updated and deleted.

SPListEventReciever: One must inherit from this base class when you want the event handler to execute when the structure of the list is modifed or the content type added or removed from the list.

SPFeatureEventReciever: Inherit this base class if you want your event handler to execute when the feature events such as installation,unstallation,activation and deactivation are executed.

SPWebEventReciever: You can Inherit this base class if you want your event handlers to execute when site is added or removed from the site collection.

SPEmailEventReciever:Inherit this base class for creating a event handler for emails that are send to a Sharepoint list.
(More...)

How can I see what assemblies are installed in the global assembly cache?

  
The .NET Framework ships with a Windows shell extension for viewing the assembly cache. Navigating to % windir%\assembly with the Windows Explorer activates the viewer. (More...)

where is global assembly cache location in system?

  
The .NET Framework ships with a Windows shell extension for viewing the assembly cache. Navigating to % windir%\assembly with the Windows Explorer activates the viewer. (More...)

the difference between a delegate and an event

  
the difference between a delegate and an event

Hi


Here is the difference between a delegate and an event.

Delegate:

public class VikramDel

{

public delegate void VikramExampleDelegate(int num1,string str1);

public VikramExampleDelegate VikramDeleageteCallback;

}

Event:

public class VikramEvent

{

public delegate void VikramExampleEvent(int num1,string str2);

public event VikramExampleEvent VikramEventCallback;

}

So syntax wise there is only one difference that we have to use the event keyword with the event.

So the question comes why do we have a keyword when the same work can be done without using it. But there is a reason for the existence of the keyword event. Lets take an example how would a client work with this class

VikramDel V = new VikramDel();

V.VikramDeleageteCallback +=new

VikramDel.VikramExampleDelegate (this.VikDelegate);

Here we are adding a new target to the invocation list of the delegate. The same code will work with the other class also without any problem

VikramEvent V = new VikramEvent();

V.VikramEventCallback + =new

VikramEvent.VikramExampleEvent(this.VikDelegate);

But consider a case where by instead of adding a new target to the invocation list of the delegate if I simply set a delegate to a new delegate (The difference is with the + sign being not there).

VikramDel V = new VikramDel();

V.VikramDeleageteCallback =new

VikramDel.VikramExampleDelegate (this.VikDelegate);

This code will work fine here but the same will not work with an event.

So what it means is that if we use the event keyword no client class can set it to null. This is very important. Multiple clients can use the same delegate. After multiple client have added a function to listen to the callback of the delegate. But now one of the client sets the delegate to null or uses the = sign to add a new call back. This means that the previous invocation list will not be used any more. Hence all the previous client will not get any of the callback even if they have registered for the call back.

Hence we can say that the even keyword adds a layer of protection on the instance of the delegate. The protection prevents any client to reset the delegate invocation list. They can only add or remove the target from the invocation list. (More...)

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