'Page' does not contain a definition for lnkPrev and no extention method 'lnkPrev' accepting......

Hi

Im quite new here. I hav a webpage in Visual Web Developer 2008 with the following error 
Compiler Error Message: 'MyWeddingAlbum' does not contain a definition for 'lnkPrev' and no extension method 'lnkPrev' accepting a first argument of type '-MyWeddingAlbum' could be found (are you missing a using directive or an assembly reference?)
Below is the source code
<asp:Panel ID="pnlPager" runat="server" Height="20px" Width="153px">
    <asp:LinkButton ID="lnkPrev" runat="server" CommandName = "Previous"
        Text = "<< Previous" OnClick = "Pager_Click"></asp:LinkButton>
    &nbsp;
    <asp:LinkButton ID="lnkNext" runat="server" CommandName = " ...