public List <Assignment> SetListAnalytic(List <Assignment> assignments)
        {
            List <Course>  courses  = new CourseService().GetList();
            List <Student> students = new StudentService().GetList();

            new Enroll().SetEnrollment(courses, students);
            List <Trainer> trainers = new TrainerService().SetList();

            new Courses_Trainers().SetCrs_Tr(courses, trainers);
            new Course_Assignment().GetCourse_Assignment(courses, assignments);
            return(assignments);
        }