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In which event are the controls fully loaded?

Posted By :iswarya     Posted Date :October 18, 2013    Points :40   Category :ASP.Net 
Page load event guarantees that all controls are fully loaded. Controls are also accessed in Page_Init events but you will see that view state is not fully loaded during this event.

You can also find related Interview Question to In which event are the controls fully loaded?  below: 

In which event are the controls fully loaded

  
Page load event guarantees that all controls are fully loaded. Controls are also accessed in Page_Init events but you will see that view state is not fully loaded during this event. (More...)

Where is image data loaded into ImageList controls actually stored in the project?

  
Each form has an associated resource file (with a .resx extension) where image data and localized strings are stored.You can see this by clicking the Show All Files icon in the Solution Explorer. (More...)

which event will perform first when a content page is loaded ?

  
Master page controls Init event is performed first when a content page is loaded. (More...)

What are server controls?

  
ASP.NET server controls are components that run on the server and encapsulate user-interface and other related functionality. They are used in ASP.NET pages and in ASP.NET code-behind classes. (More...)

What is the difference between login controls and Forms authentication?

  
Login controls are an easy way to implement Forms authentication without having to write any code. For example, the Login control performs the same functions you would normally perform when using the FormsAuthentication class—prompt for user credentials, validate them, and issue the authentication ticket—but with all the functionality wrapped in a control that you can just drag from the Toolbox in Visual Studio. Under the covers, the login control uses the FormsAuthentication class (for example, to issue the authentication ticket) and ASP.NET membership (to validate the user credentials). Naturally, you can still use Forms authentication yourself, and applications you have that currently use it will continue to run. (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 ?

  
When you have a complex control, like DataGrid, writing an event processing routine for each object (cell, button, row, etc.) is quite tedious. The controls can bubble up their eventhandlers, allowing the main DataGrid event handler to take care of its constituents (More...)

How many types of validation controls are provided by ASP.NET ?

  
There are six main types of validation controls:-

RequiredFieldValidator: It checks whether the control have any value. It's used when you want the control should not be empty.

RangeValidator: It checks if the value in validated control is in that specific range.

CompareValidator: It checks that the value in controls should match the value in other control.

RegularExpressionValidator: When we want the control value should match with a specific regular expression.

CustomValidator: It is used to define UserDefined validation.

ValidationSummary: It displays summary of all current validation errors. (More...)

How do I detach an event handler?

  
In the same way you attach an event handler, except using the -= operator.
For example:

button1.Click -= new EventHandler (button1_Click); (More...)

How can we check that some changes have been made to dataset since it was loaded?

  


The changes made to the dataset can be tracked using the GetChanges and HasChanges methods.
GetChanges():
-------------
The GetChanges returns dataset which are changed since it was loaded or since Acceptchanges was executed.

HasChanges():
------------
The HasChanges property indicates if any changes were made to the dataset since it was loaded or if acceptchanges method was executed.

RejectChanges():
----------------
The RejectChanges can be used to revert thee changes made to the dataset since it was loaded

(More...)

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