在datalist里嵌套了一组RadioButtonList，如何访问这组控件？

[sam70168]

<asp:DataList ID="dlist" runat="server" CellPadding="1" CellSpacing="0" Width="100%" RepeatDirection="Horizontal"RepeatColumns="3" OnItemCommand="voteThis" DataKeyField="voteitem_id">
<ItemTemplate>
<asp:RadioButtonList id="RadioButtonList2" runat="server">
<asp:ListItem Value="1">选购</asp:ListItem>
<asp:ListItem Value="2">选购</asp:ListItem>
<asp:ListItem Value="3">选购</asp:ListItem>
</asp:RadioButtonList>
<asp:linkButton id="Button1" runat="server" Text="确定;" CommandName="select"></asp:linkButton>
</ItemTemplate>
</asp:DataList>

.............................................
Sub voteThis(ByVal sender As Object, ByVal e As DataListCommandEventArgs)
Dim r5 As RadioButtonList = CType(e.Item.FindControl"RadioButtonList2"),RadioButtonList)
Response.Write(r5.SelectedItem.Value)
End Sub

报错：“未将对象引用设置到对象的实例”

要怎样写？？？请教

[smile9961]

DataList的ItemDataBound事件中：
If e.Item.ItemType = ListItemType.AlternatingItem Or e.Item.ItemType = ListItemType.Item Then
Dim r5 As RadioButtonList = CType(e.Item.FindControl"RadioButtonList2"),RadioButtonList)
Response.Write(r5.SelectedItem.Value)

End if

[artak]

C#
if(e.Item.ItemType == ListItemType.Item||e.Item.ItemType == ListItemType.AlterNatingItem)
{
在用FindControl
}

[sam70168]

还是报一样的错！！！

[hchxxzx]

Sub voteThis(ByVal sender As Object, ByVal e As DataListCommandEventArgs)
Dim r5 As RadioButtonList = CType(e.Item.FindControl("RadioButtonList2")),RadioButtonList)
Response.Write(r5.SelectedItem.Value)
End Sub

[sam70168]

还是一样！！！ 你们有运行过吗？不会是我的电脑问题吧！！！