public List <Models.BU.Teacher> GetTeacherList()
        {
            Models.Database          db          = new Models.Database();
            string                   query       = "SELECT * FROM UserAccount WHERE Role = '2' OR Role = '3'"; // Teacher en Examiner
            List <Models.BU.Teacher> teacherList = db.GetTeacherList(query);

            // Vul wishList van Teachers
            foreach (Models.BU.Teacher teacher in teacherList)
            {
                query            = "SELECT DISTINCT * FROM Wish WHERE UserId = '" + teacher.UserID + "'";
                teacher.wishList = db.GetWishListOfTeacher(query);
            }
            return(teacherList);
        }