public ActionResult Create(GroupModel model)
        {
            var memberMapper = new MemberMapper();
              memberMapper.CreateMap<GroupModel, Group>();

              var ctx = new CourseContext();

              ctx.Groups.Add(memberMapper.Map<GroupModel, Group>(model));
              ctx.SaveChanges();

              return RedirectToAction("Index");
        }
        public ActionResult Edit(int id, GroupModel model)
        {
            CourseContext ctx = new CourseContext();
              var group = ctx.Groups.FirstOrDefault(c => c.ID == model.ID);

              group.Name = model.Name;
              group.Identifier = model.Identifier;

              ctx.SaveChanges();

              return RedirectToAction("Index");
        }