asp.net中Repeater控制項裡Radiobutton如何?單選

HTML code

<table>
<asp:Repeater ID="Repeater1" runat="server">
<ItemTemplate>
<tr>
<td><%#Eval("Areaname") %></td>
<td> <asp:RadioButton ID="rdb1" runat="server" AutoPostBack="true" oncheckedchanged="RadioButton_CheckedChanged"/>
</td>
</tr>
</ItemTemplate>
</asp:Repeater>
</table>

C# code

protected void RadioButton_CheckedChanged(object sender, EventArgs e)
    {
        RadioButton rdb = sender as RadioButton;
        RepeaterItem item = rdb.Parent as RepeaterItem;
int count = Repeater1.Items.Count;
for (int i = 0; i < count; i++)
        {
            RadioButton rdb1 = Repeater1.Items[i].FindControl("rdb1") as RadioButton;
if (i != item.ItemIndex)
            {
                rdb1.Checked = false;
            }
        }
    }