1.
Init() - when the page is instantiated
Load() - when the page is loaded into server memory
PreRender() - the brief moment before the page is displayed to the user as HTML
Unload() - when page finishes loading.
3. After the Init() and before the Page_Load(), or OnLoad() for a control.
4.Client side is done by default. Server side validation is also possible. We can switch off the client side and server side can be done.
5.System.Web.UI.Page
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