获取repeater控件中选中行的某个字段的值

<table border="0" cellpadding="0" cellspacing="0">
    <asp:Repeater ID="Repeater1" runat="server">
        <HeaderTemplate>
            <tr>
                <th colspan="5">
                    身份证号列表
                </th>
            </tr>
            <tr>
                <td>
                    序号
                </td>
                <td>
                    身份证号
                </td>
                <td>
                    姓名
                </td>
                <td>
                    状态
                </td>
                <td>
                    全选<input type="checkbox" name="a" value="" id="quxuan" />
                </td>
            </tr>
        </HeaderTemplate>
        <ItemTemplate>
            <tr>
                <td style="display: none">
                    <label class="mingxiid">
                        <%#Eval("MingxiId")%></label>
                </td>
                <td>
                    <%#this.Repeater1.Items.Count + 1%>
                </td>
                <td>
                    <%#Eval("Idcard")%>
                </td>
                <td>
                    <%#Eval("Name")%>
                </td>
                <td>
                    <%#Eval("State")%>
                </td>
                <td>
                    <input type="checkbox" name="b" value="" class="cbk" />
                </td>
            </tr>
        </ItemTemplate>
    </asp:Repeater>
</table>
<asp:Button ID="Button1" class="btn" runat="server" Text="确认预约" />
<asp:Button ID="Button2" class="btn" runat="server" Text="取消预约" />
<asp:Button ID="Button3" class="btn" runat="server" Text="返回" />

 当我点击下面的三个按钮的时候怎么获取到隐藏的td中的label的值，也就是当前行的<%#Eval("MingxiId")%>值，在线等，求解

http://www.cnblogs.com/luqingsong/archive/2011/01/11/1933347.html