VS comes with an interactive C# window that basically serves this purpose. Aside from that, you can always write a unit test and set a breakpoint to inspect whe

VS comes with an interactive C# window that basically serves this purpose. Aside from that, you can always write a unit test and set a breakpoint to inspect whether something works as you think it does. In my opinion both these options are superior to running a file for that use case (though running a C# file would certainly have other uses that tests/REPL aren't sufficient for).