在WebForm1页面上直接放置用户控件WebUserControl1时的事件顺序
  WebUserControl1_Init <br>
  WebForm1_Init <br>
  Page_Load <br>
  WebUserControl1_Load <br>
  WebForm1_PreRender <br>
  WebUserControl1_PreRender <br>
  WebUserControl1_Unload <br>
  WebForm1_Unload <br>
在WebForm1页面的OnInit方法中用代码Load用户控件WebUserControl1时的事件顺序:
  WebForm1_Init : OnInit
  WebForm1: Loading controls
  WebUserControl1_Init : OnInit
  WebForm1: added to Controls
  WebForm1: LoadViewState
  WebUserControl1: LoadViewState
  WebUserControl1: LoadPostData Begin
  WebUserControl1: LoadPostData End
  WebForm1_PageLoad: OnLoad after base's Onload.
  WebUserControl1_Load: after base's OnLoad
  iWebUserControl1: RaisePostDataChange
  WebForm1: OnPreRender
  WebUserControl1: OnPreRender
  WebForm1: SavedViewState
  WebUserControl1: SaveViewState
在WebForm1页面的Page_Load方法中用代码Load用户控件WebUserControl1时的事件顺序
  WebForm1_Init : OnInit
  WebForm1: LoadViewState
  WebForm1_PageLoad: OnLoad after base's Onload.
  WebForm1: Loading controls
  WebUserControl1_Init : OnInit
  WebUserControl1: LoadViewState
  WebForm1: added to Controls
  WebUserControl1_Load: after base's OnLoad
  WebUserControl1: LoadPostData Begin
  WebUserControl1: LoadPostData End
  iWebUserControl1: RaisePostDataChange
  WebForm1: OnPreRender
  WebUserControl1: OnPreRender
  WebForm1: SavedViewState
  WebUserControl1: SaveViewState
在WebForm1页面的Button1_Click事件中用代码Load用户控件WebUserControl1时的事件顺序:
  WebForm1_Init <br>
  Page_Load <br>
  Button1_Click <br>
  WebUserControl1_Init <br>
  WebUserControl1_Load <br>
  WebForm1_PreRender <br>
  WebUserControl1_PreRender <br>
  WebUserControl1_Unload <br>
  WebForm1_Unload <br>
在WebForm1页面的Page_Load事件中用代码Load用户控件WebUserControl1,WebUserControl1又在Page_Load事件中用代码Load用户控件WebUserControl2时的事件顺序:
  WebForm1_Init <br>
  Page_Load <br>
  WebUserControl1_Init <br>
  WebUserControl1_Load <br>
  WebUserControl2_Init <br>
  WebUserControl2_Load <br>
  WebForm1_PreRender <br>
  WebUserControl1_PreRender <br>
  WebUserControl2_PreRender <br>
  WebUserControl2_Unload <br>
  WebUserControl1_Unload <br>
  WebForm1_Unload <br>