Set of subprograms that are executed towards each time of web page processing
are called "page life cycle events"

Page Preinit

This will be executed before memory initialization for web page [before
constructing web page]

Attaching theme, master page dynamically to webpage is possible using preinit
event proc

Page init

This will be executed when memory is initialized for webpage

Page load

This will be executed when submitted data and controls are loaded

Database connectivity, reading submitted data can be placed within pageload

PagePrerender

This will be executed before rendering html content from server side control

Control behaviour can be changed b4 producing client side control

Page Unload

This will be executed once memory is released for webpage

Closing database connection