List the events in page life cycle

In ASP.NET, the page life cycle refers to the series of events that occur from the time a page is requested until the time the page is fully rendered and sent to the client browser. Understanding the page life cycle is crucial for developing web applications effectively. Here are the events in the ASP.NET page life cycle:

1. Page Request: The page is requested by a user or browser.
2. Start: This event marks the beginning of the page life cycle. At this stage, the request has been identified as a page request and ASP.NET initializes the page.
3. Initialization: This event occurs just after the page and its controls have been initialized, and any skin settings have been applied.
4. Load: During this stage, controls on the page are loaded with the values restored from the ViewState and control properties are set. This is a crucial stage where you often perform initialization tasks, such as retrieving data from a database and binding it to controls.
5. Postback Event Handling: If the request is a postback, control event handlers are executed. This includes button clicks, dropdown selections, etc.
6. Rendering: This event occurs just before the page’s HTML is generated. During this phase, controls on the page are rendered into markup.
7. Pre-render: This event occurs after the control hierarchy is built and all child controls are created. At this stage, you can perform any cleanup or additional changes to the controls before they are rendered.
8. Save State: The state of the controls is saved to the ViewState.
9. Unload: This event occurs after the page has been fully rendered and sent to the client browser. At this stage, cleanup operations can be performed.

It’s essential to understand these events and their sequence to effectively manage the page’s behavior and perform necessary tasks at each stage of the life cycle. This understanding is crucial not only for interview purposes but also for developing robust ASP.NET applications.