F# compiles down into the same IL code as VB and C#. This means that you can have a solution that contains both C# and F# projects.
http://connelhooley.uk/blog/2017/04/30/f-sharp-to-c-sharp
origin - http://www.pipiscrew.com/2017/05/calling-f-code-in-a-c-project/ calling-f-code-in-a-c-project