Events in ASP.NET Master and Content Pages

Both master pages and content pages can
contain event handlers for controls. For controls, events are handled
locally—a control in a content page raises an event in the content
page, and a control in the master page raises an event in the master
page. Controls events are not sent from the content page to the master
page. Similarly, you cannot handle an event from a master page control
in a content page.

In some cases, the same event is raised in both the content and the
master page. For example, both pages raise Init and Load
events. The general rule for how events are raised is that the
initialization events are raised from the innermost control to the
outermost one, and all other events are raised from the outermost
control to the innermost one. It is helpful to remember that the master
page is merged into the content page and treated as a control in the
content page.

The following is the sequence in which events occur when a master page is merged with a content page:

  1. Content page PreInit event.

  2. Master page controls Init event.

  3. Content controls Init event.

  4. Master page Init event.

  5. Content page Init event.

  6. Content page Load event.

  7. Master page Load event.

  8. Master page controls Load event.

  9. Content page controls Load event.

  10. Content page PreRender event.

  11. Master page PreRender event.

  12. Master page controls PreRender event.

  13. Content page controls PreRender event.

  14. Master page controls Unload event.

  15. Content page controls Unload event.

  16. Master page Unload event.

  17. Content page Unload event.

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