Use of switch in Repeater

This is the code in ASPX

<asp:Repeater ID="OrderList" runat="server">
         <ItemTemplate>
          <%#this.info(Eval("id").ToString(), Eval("id").ToString())%>
         </ItemTemplate>
</asp:Repeater>

Here is the code in CS

protected void Page_Load(object sender, EventArgs e)
    {    
        .......
     } 
protected string info(string id)
    {
        switch (num)
        {
            case "0":
                returnStr = "ID for 0";
                break;
            case "1":
                returnStr = "ID for 1";
                break;
            case "2":
                returnStr = "ID for 2";
                break;
            case "3":
                returnStr = "ID for 3";
                break;
            case "4":
                returnStr = "ID for 3";
                break;
        }
        return returnStr;
    }