Repeater里switch的使用方法

这是aspx里的代码

<asp:repeater id="orderlist" runat="server">
         <itemtemplate>
          <%#this.info(eval("id").tostring(), eval("id").tostring())%>
         </itemtemplate>
</asp:repeater>

下面是cs里代码

protected void page_load(object sender, eventargs e)
    {   
        .......
    ｝
protected string info(string id)
    {
        switch (num)
        {
            case "0":
                returnstr = "id为0";
                break;
            case "1":
                returnstr = "id为1";
                break;
            case "2":
                returnstr = "id为2";
                break;
            case "3":
                returnstr = "id为3";
                break;
            case "4":
                returnstr = "id为3";
                break;
        }
        return returnstr;
    }