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Does Session_End event supported accross all session modes ?

Posted By :Maverick     Posted Date :July 29, 2011    Points :40   Category :.NET Framework 
Session_End event occurs only in "Inproc mode"."State Server" and "SQL SERVER" do not have Session_End event.

You can also find related Interview Question to Does Session_End event supported accross all session modes ?  below: 

Differences between application and session.

  
The session object maintains state on a per client basis whereas the application object is on a per application basis and is consistent across all client requests. (More...)

Session state vs View state

  
In some cases, using view state is not feasible. The alternative for view state is session state. Session state is employed under the following situations:
. Large amounts of data - View state tends to increase the size of both the HTML page sent to the browser and the size of form posted back. Hence session state is used.
. Secure data - Though the view state data is encoded and may be encrypted, it is better and secure if no sensitive data is sent to the client. Thus, session state is a more secure option.
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what is different between session and application

  
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->But application object are global for each user (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...)

What's a Bubbled Event ?

  
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In the same way you attach an event handler, except using the -= operator.
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button1.Click -= new EventHandler (button1_Click); (More...)

How to remove a Session variable?

  
using HttpSessionState.Remove(); (More...)

What is Event Bubbling?(Asp.net)

  
Server Controls like DataGrid,DataGridView , DataList etc have other controls inside them.
Example an DataGridView can have an TextBox or an button inside it.
These Child Controls can not raize events by themselves,but they pass the event to the parent control (DataGridView), which is passed to the page as "ItemCommand" event.
This process is known as EventBubling?

====================================================================
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Page_PreInit is the First event that will be executed on the page. (More...)

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