MasterPage 和 page 事件顺序
--First load
Master->OnInit
page->OnInit
page->OnLoad (start)
page->Page_Load
page->OnLoad (End)
Master->OnLoad(start)
Master->Page_Load
Master->OnLoad(end)
page->OnPreRender
Master->OnPreRender
Master->OnUnload
page->OnUnload
--click button in page
Master->OnInit
page->OnInit
page->OnLoad (start)
page->Page_Load
page->OnLoad (End)
Page->Button1_Click
page->OnPreRender
Master->OnPreRender
Master->OnUnload
page->OnUnload
-->click button in master
Master->OnInit
page->OnInit
page->OnLoad (start)
page->Page_Load
page->OnLoad (End)
Master->OnLoad(start)
Master->Page_Load
Master->OnLoad(end)
Master->ButtonMaster_Click
page->OnPreRender
Master->OnPreRender
Master->OnUnload
page->OnUnload