Html.ActionLink, Url.ActionLink and Html.RountLink all of them returns empty url even though the target url is valid and displayed properly from url?

Question

Html.ActionLink, Url.ActionLink and Html.RountLink all of them returns empty url even though the target url is valid and displayed properly from url?

I played the route arount, it keeps return empty url without any exception.

It's asp.net mvc 2 project with .net 3.5