生命周期

Page_preInit (常用)
Page_Init     (常用)   主要完成页面初始化时运行（只运行一次）
Page_InitComplete 
Page_PreLoad 
page_Load     (常用) 页面读放内存时运行，每次都会初触发
page_LoadComplete 
Button_Click 
page_PreRender(常用)
Page_PreRenderComplete 
Page_SaveStateComplete 

     protected void Page_PreInit(object sender, EventArgs e)
     {        
         Response.Write("我执行了Page_PreInit<br/>");
     }

     protected void Page_Init(object sender, EventArgs e)
     {
         Response.Write("我执行了Page_Init<br/>");
     }

     protected void Page_InitComplete(object sender, EventArgs e)
     {
         Response.Write("我执行了Page_InitComplete<br/>");
     }
     protected void Page_PreLoad(object sender, EventArgs e)
     {
         Response.Write("我执行了Page_PreLoad<br/>");
     }
     protected void Page_Load(object sender, EventArgs e)
     {
         Response.Write("我执行了Page_Load<br/>");
     }
     protected void Page_LoadComplete(object sender, EventArgs e)
     {
         Response.Write("我执行了Page_LoadComplete<br/>");
     }
     protected void Page_PreRender(object sender, EventArgs e)
     {
         Response.Write("我执行了Page_PreRender<br/>");
     }
     protected void Page_Render(object sender, EventArgs e)
     {
         Response.Write("我执行了Page_Render<br/>");
     }
     protected void Page_PreRenderComplete(object sender, EventArgs e)
     {
         Response.Write("我执行了Page_PreRenderComplete<br/>");
     }
     protected void Page_SaveStateComplete(object sender, EventArgs e)
     {
         Response.Write("我执行了Page_SaveStateComplete<br/>");
     }

     protected void Page_Unload(object sender, EventArgs e)
     {
         //Response.Redirect("Default3.aspx");
         //Response.Write("我执行了Page_UnLoad<br/>");
     }