Redirect to an aspx page inside a dll file

Hi all,
I did an web application with some web pages and I compile it to a dll file (SamlConnect.dll).
My goal is to use this compiled app inside other applications. To do it, I did a test app where I imported this new dll (references -> add new reference). Now I need to call a aspx page (start.aspx) that is inside the SamlConnect dll. I've tried several forms of "Response.Redirect("start.aspx");" but I'm always getting a 404 Page not found error.
Is there any particular way of doing it?

Thanks in advance for your help,
Marc