public List <Studierichting> getStudierichting()
        {
            StudierichtingMapper mapper = new StudierichtingMapper(_connectionString);

            return(mapper.getStudierichtingFromDB());
        }
        public void removeStudierichting(int id)
        {
            StudierichtingMapper mapper = new StudierichtingMapper(_connectionString);

            mapper.removeStudierichtingFromDB(id);
        }
        public void adjustStudierichting(Studierichting studierichting, int id)
        {
            StudierichtingMapper mapper = new StudierichtingMapper(_connectionString);

            mapper.AdjustStudentFromDB(studierichting, id);
        }
        public void addStudierichting(Studierichting studierichting)
        {
            StudierichtingMapper mapper = new StudierichtingMapper(_connectionString);

            mapper.addStudierichtingToDB(studierichting);
        }