C# project to WPF?

Question

Hi all, this is my first post here so forgive me if I break some forum rules. I am sure this question has come up before but I couldn't find any articles on it.
I have a project that was developed in MFC but will now be using C# for the UI and C++ Interop for the backend. What I want to know is if I developed the UI in C# and then later want to use WPF for the UI. Would I have to re-write the UI app in WPF or is it possible to convert the C# UI app to use the WPF framework?
Thanks in advance.
John