encode url having Xpath in Query String

I want to send title of news to some other page through query string. My title is dynamic so it may contain '&' or other special characters. So I tried this

<a href="NewsByTitle.aspx?title=<%#HttpServerUtility.HtmlEncode(XPath("title"))%>"

But I am getting error "The best overloaded method match for 'System.Web.HttpServerUtility.HtmlEncode(string)' has some invalid arguments"Please help me.