General Page Life-Cycle Stages in Asp.net

In general terms, the page goes through the stages outlined in the following table. In addition to the page life-cycle stages, there are application stages that occur before and after a request but are not specific to a page.
that i will explain later.

Some parts of the life cycle occur only when a page is processed as a postback. For postbacks, the page life cycle is the same during a partial-page postback (as when you use an UpdatePanel control) as it is during a full-page postback.

Stage	Description
Page request	Before the page life cycle begins.  Determines whether run whole page or send a cached version of the page to browser without running the page. (For Caching)
Start	Request and Response objects are set. Determines whether the request is a postback or a new request and sets the IsPostBack property. Also sets the UICulture property (for globalization-before initialise controls).
Initialization	controls on the page are available and each control's UniqueID property is set.  A master page and themes are also applied to the page.  If the current request is a postback, the postback data has not yet been loaded and control property values have not been restored to the values from view state.
Load	During load, if the current request is a postback, control properties are loaded with information recovered from view state and control state.
Postback event handling	If the request is a postback, control's event handlers are called.  Validate() method of all validator controls is called, which sets the IsValid property of individual validator controls and of the page.
Rendering	Before rendering, view state is saved for the page and all controls.  During the rendering stage, the page calls the Render() method for each control, providing a text writer that writes its output to the OutputStream object of the page's Response property.
Unload	After the page has been fully rendered, sent to the client, and is ready to be discarded. At this point, page properties such as Response and Request are unloaded and cleanup is performed.