Character is not valid when using hyperlink

[Guest]

I'm trying to use this hyperlink be low but its giving error
Character is not valid at %>
Don't know why
Any ideas?

<asp:HyperLink ID="Hyperlink1" NavigateUrl='<%#"addtocart.aspx?productid="
& DataBinder.Eval(Container.DataItem, "ProductID") & "" & P1 & "" & No & ""
%><%= s %>' Runat="server" CssClass="ProductListItem">Add To
Cart</asp:HyperLink>