把一个 Label1 放到 UpdatePanel 里面，
label = (Label)ctrl.FindControl( "Label1 ");
调试提示：label 为 null，运行出错：未将对象引用设置到对象的实例。
但是只要把 Label1 拖到 UpdatePanel 外面，是没问题的！
大家帮帮忙吧。
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<script runat= "server " language= "vb ">
Sub ttk(sender as object,e as system.eventargs)
Dim lb1 as label
lb=page.findcontrol( "label1 ")
lb.text= "你好，这是updatepanel里的label "
Eend sub
</script>
<form runat= "server ">
<asp:Updatepanel id= "update1 " ChildrenAsTriggers= "true " runat= "server " UpdateMode= "Always ">
<contenttemplate>
<asp:label runat= "server " ID= "label1 "/>
<cc1:popupwin id= "ppw " style= "Z-INDEX: 105; right: 0px; POSITION: absolute; TOP: 128px " runat= "server " width= "230px " height= "150px " windowsize= "300, 200 " windowscroll= "False " dockmode= "BottomLeft " colorstyle= "Blue " gradientdark= "210, 200, 220 " textcolor= "0, 0, 3 " shadow= "125, 90, 160 " lightshadow= "185, 170, 200 " darkshadow= "128, 0, 102 " visible= "False " showlink= "True " OffsetX= "0 ">
</cc1:popupwin>
<asp:Timer id= "tm1 " runat= "server " enabled= "true " interval= "10000 " ontick= "ttk "> </asp:Timer>
</contenttemplate>
</asp:Updatepanel>
</form>
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他会每隔10秒更新label1的内容，你也可以把它改成
Sub ttk(sender as object,e as system.eventargs)
Dim lb1 as label
lb=page.findcontrol( "label1 ")
lb.text= "你好，这是updatepanel里的label "
Eend sub
to
Sub ttk(sender as object,e as system.eventargs)
Dim lb1 as label
lb=page.findcontrol( "label1 ")
lb.text=now()
Eend sub
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Updatepanel 是要放一个
在body中 <asp:ScriptManager ID= "ScriptManager1 " runat= "server "> </asp:ScriptManager>
控件才能使用
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UpdatePanel控件熟悉?我也不是很熟悉!菜鸟 !
下面的你参考!参考
<asp:UpdatePanel ID= "UpdatePanel1 " runat= "server " UpdateMode= "Conditional ">
<ContentTemplate>
<asp:Button ID= "Button1 " runat= "server " OnClick= "Button1_Click " Text= "确定 " />
<asp:Button ID= "Button2 " runat= "server " Text= "取消 " OnClick= "Button2_Click " />
<asp:Label runat= "server " ID= "InputTimeLabel "> <%=DateTime.Now %> </asp:Label>
</ContentTemplate>
</asp:UpdatePanel>
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linjone()说得对
刚才忘记放 <asp:ScriptManager ID= "ScriptManager1 " runat= "server "> </asp:ScriptManager>
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Up
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