public void AddStudent(Student student)
        {
            switch (student.StudentCampus)
            {
            case Campus.Lev:
                if (student.StudentGender != Gender.male)
                {
                    throw new Exception("campus Lev is only for men");
                }
                break;

            case Campus.Tal:
                if (student.StudentGender != Gender.female)
                {
                    throw new Exception("campus Tal is only for women");
                }
                break;

            default:
                break;
            }

            dal.AddStudent(student);
        }