By default Visual Studios 2019 will not have C++ windows forms.
You can install it in VS 2019 by going to extensions -> manage extensions.
Search and install the C++/CLR windows forms for Visual Studios.
For example projects, you can refer to the C++ applications in the FX3 SDK.
path: <Fx3 installation directory>\1.3\application\cpp
Thank you a lot! It work!