I have developed a little game using XNA 4.0 and C# (new Project->Windows Game 4.0 ).
Now I have to refactor all the game logic and write it in F#.
I created a new project for my F# library(new Project->F# Library), and added the XNA library to the project’s references.
Now, how can I include the F# library inside my C# project?
I assume the problem is referencing your F# library project from your C# one, rather than using the XNA library from in your F# project.
In the same way you’d reference a C# project:
Add the F# project to your solution and add a reference to the F# project in your other one