In principle, you can do it, but it makes no practical sense, really. You better write pure .NET UI and use some semantic code from C++, perhaps without MFC at all.
Anyway, you if want to use C++ code in .NET assembly, there are just two approaches.
First approach: use P/Invoke. You can learn it:
http://en.wikipedia.org/wiki/P/Invoke[
^],
http://msdn.microsoft.com/en-us/library/Aa712982[
^].
This CodeProject article can also be useful:
Essential P/Invoke[
^].
Second approach is based on using C++/CLI. You can either re-write your C++ code into C++/CLI or create a mixed-mode (managed+unmanaged) project combining C++/CLI with your legacy C++ code. You can then wrap your C++ code in C++/CLI ("ref") classes or structures and make them public. You can reference such mixed-mode assembly just like a normal .NET assembly in your C# project.
See also:
http://en.wikipedia.org/wiki/C%2B%2B/CLI[
^],
http://www.ecma-international.org/publications/standards/Ecma-372.htm[
^],
http://msdn.microsoft.com/en-us/library/xey702bw.aspx[
^].
—SA
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