adding a variable inside a hyperlink template (inside a datalist)

[Dave]

Hi ,

I have the following where I need to append a string variable inside a
hyperlink
template, inside a datalist. The variable 'categoryList' is the culprit.
No matter where this variable is declared, the compiler says it is
'undefined'.
What am I missing here? I am a newbie to ASP.NET trying to rebuild my ASP
library.
<asp:datalist id="list" Height="8px" Width="250px" runat="server">

<ItemTemplate>

&nbsp;

<asp:HyperLink id="HyperLink1" runat="server"
CssClass="CategoryUnselected" NavigateUrl='<%# "../index.aspx?catID=" &
categoryList & "|" & DataBinder.Eval(Container.DataItem, "CategoryID")%>'
Text='<%# DataBinder.Eval(Container.DataItem, "CategoryName") %>'>

</asp:HyperLink><br />

</ItemTemplate>

</asp:datalist>

TIA