当有一个值传过来时实现在DataList里实现单选钮,单选

在做项目时,遇到从一个页面传个值过来.实现DataList的单选钮单选,刚看上觉得挺容易的没想到亲手做时,却不像想的那样,找了不少资料,前台代码:<form id="form1" runat="server">    <div align="center">        <input type="hidden" id="rd" runat="server" name="rd">        <asp:DataList ID="DataList1" runat="server" DataKeyField="p_id" RepeatColumns="5" RepeatDirection="Horizontal" Width="700px">            <ItemTemplate>                <table border="0" cellpadding="0" cellspacing="0">                    <tr>                        <td>                            <im