static void Main(string[] args) { var cppManager = new CallbackManager(); cppManager.OnEnum += HandleCpp; var student = new StudentWrapper("Gareth", 45); Console.WriteLine($"Student Name: {student.Name}"); Console.WriteLine($"Student GPA: {student.Gpa}"); //new FormHandler().ShowMessageBox("From C#"); cppManager.RaiseEvent(1); Console.ReadLine(); }