In Visual C++ inside Visual Studio, one of the project subtypes is a "Makefile" Project.
But there doesn't seem to be an equivalent for Visual C# inside Visual Studio?
BTW, a Makefile project is:
"If you have a project that you build from the command line with a makefile, then the Visual Studio development environment will not recognize your project. To open and build your project using Visual Studio, first create an empty project containing the appropriate build settings using the Makefile Project Wizard. You can then use this project to build your project from the Visual Studio development environment.
The project displays no files in Solution Explorer. The project specifies the build settings, which are reflected in the project's property page."