This barely mentions Windows Forms, which is the cleanest and fastest way to code Windows GUI apps.
A few years ago, I wanted to prototype something quick and I wrote it in Windows Forms over C# (all code, no visual editor).
Winforms is a Win32 API wrapper, so on the same level as MFC, not a separate UI framework.
>This barely mentions Windows Forms
Apparently, you do too, since what you said is basically the same as what the article said (.NET wrapper for C#, fastest prototyping to date)