Skip to main content

Page life cycle of ASP.net page



The stsges of Page life cycle are as follows :
Methods Description
Page_Init Page Initialization
LoadViewState View State Loading
LoadPostData Postback Data Processing
Page_Load Page Loading
RaisePostDataChangedEvent PostBack Change Notification
RaisePostBackEvent PostBack Event Handling
Page_PreRender Page Pre Rendering Phase
SaveViewState View State Saving
Page_Render Page Rendering
Page_Unload Page Unloading

Page_Init :

The Page_Init event is the first event to be triggered in the page life cycle. In this the control tree has been created, the controls declared in the .aspx file are initialized. The viewstate is not available at this stage. We can create or re-create the controls that need to be created or re-created dynamically.

LoadViewState :

The Viewstate contains stored information that is set by the page and controls of the page. But the load view state event only occurs when the page has been posted back. Due to viewstate control's and page itself store information that is persistent among web requests. It contains the state of the controls the last time the page was processed on the server.

LoadPostData :

After viewstate is loaded the control are updated with posted values or values that are entered or changed by user.

Page_Load :

After Loadpostdata the page_load event is fired. In this event code written inside page load is executed once at the beginning of the page.

RaisePostDataChangedEvent :

In this event when user clicks submit button or any other button then it changes state of the page and the event related to that button is raised.

RaisePostBackEvent :

This methods knows which event has occurred and which related method you need to call like btnsubmit is clicked then it will call method related to it like “btnsubmit_click” to perform its functionality.

Page_PreRender :

At this stage page is prepared for Rendering and if user wants to chage anything he can change it here only as in this event viewstate is not saved and output is not rendered.

SaveViewState :

In this event values of viewstate is saved to control own viewstate collection. The resultant viewstate is serialized, hashed, base24 encoded and associated with the _viewstate hidden field.

Page_Render :

This method takes the HtmlWriter object and uses it to accumulate all HTML text to be generated for the control. For each control the page calls the render method and caches the HTML output.

Page_unload :

During this method, data can be released to free up resources on the server for other processes. Once this method is completed, the HTML is sent to the browser for client side processing.

Comments

Popular posts from this blog

JQuery lightbox image slideshow gallery in asp.net

Introduction: In this article I will explain how to create lightbox image slideshow in asp.net using JQuery. Description:  In previous post I explained about  Ajax SlideshowExtender sample  to display images slideshow. Now in this article I will explain how to create lightbox image slideshow in asp.net using JQuery. In many websites generally we will see different types of slideshows like whenever we click on image that is automatically open with lightbox effect and we have a chance to see all the remaining images by press next or previous options in slideshow. All these Slideshows are implemented by using JQuery plugins. After seen those slideshows I decided to write post to use JQuery plugins to implement beautiful slideshown in asp.net.  To implement this one I am using  previous post  insert and display images from folder based on imagepath in database  because in that post I explained clearly how to insert images into our project folder a...

Editing Child GridView in Nested GridView

Editing Child GridView in Nested GridView In this article we will explore how to edit child gridview in the nested gridview.   Let''s write some code. Step 1:  Add scriptmanager in the aspx page. < asp : ScriptManager   ID ="ScriptManager1"   runat ="server"   EnablePageMethods ="true"> </ asp : ScriptManager > Step 2:  Add below stylesheet for modal popup. < style   type ="text/css">        .modalBackground        {              background-color : Gray;              filter : alpha(opacity=80);              opacity : 0.5;       }        .ModalWindow        {     ...

Add Edit Update Records in GridView using Modal Popup in ASP.Net

Add Edit Update Records in GridView using Modal Popup in ASP.Net In this article, I’ll explain how to Add and Edit records in ASP.Net GridView control using ASP.Net AJAX Control Toolkit Modal Popup Extender. Database For this tutorial, I am using Microsoft’s NorthWind database. You can download it using the following link. Download Northwind Database Connection string Below is the connection string to connect to the database. < connectionStrings >     < add name = " conString "      connectionString = " Data Source=.\SQLExpress;database=Northwind;     Integrated Security=true " /> </ connectionStrings >   HTML Markup Below is the HTML Markup of the page. Below you will notice that I have placed a Script Manager and an ASP.Net Update Panel on the page. Inside the Update Panel I have placed an ASP.Net GridView Control along with a Modal Popup Extender that will be used to Add or...