BC30037: Character is not valid.

[Patrick Olurotimi Ige]

I'm trying to pass some values to this hyperlink
but 'm getting error Character is not valid.
at the line %> after the P1

If i use the same with <a href> it works fine..
Can anybody help.
Thanks in Advance

<asp:HyperLink ID="Hyperlink2"
NavigateUrl='<%#"addtocart.aspx?productid=" &
DataBinder.Eval(Container.DataItem, "ProductID") & "" & No & "" & P1 &
""%><%=s %>' Runat="server" CssClass="ProductListItem" onmouseover="void
validateNumericField(document.Form1.txtphone);">Add To
Cart</asp:HyperLink>