We have done a major advance on using C# (or any other .NET based language) from FWH 
This is going to be part of FWH 18.05
For now, please start testing this:
1. How to build a C# DLL:
test.cs
To build it as a DLL do this:
call "%ProgramFiles(x86)%\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvarsall.bat" x86
csc /out:test.dll /target:library test.cs
Next: I will explain you how to run it from FWH 18.05
This is going to be part of FWH 18.05
For now, please start testing this:
1. How to build a C# DLL:
test.cs
using System.Windows.Forms;
namespace dllNamespace
{
  public class dllClass
  {
    public static int ShowMsg( string msg )
    {
      MessageBox.Show( msg );
      return 0;
    }
  }
}To build it as a DLL do this:
call "%ProgramFiles(x86)%\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvarsall.bat" x86
csc /out:test.dll /target:library test.cs
Next: I will explain you how to run it from FWH 18.05
