public async Task <IActionResult> Create([Bind("GroupId")] Group @group)
        {
            if (ModelState.IsValid)
            {
                _context.Add(@group);
                await _context.SaveChangesAsync();

                return(RedirectToAction(nameof(Index)));
            }
            return(View(@group));
        }
        public CourseTask Create(CourseTask courseTask, Guid executorId)
        {
            if (courseTask.AuthorId != executorId)
            {
                throw new ArgumentException("Other id marked as author");
            }

            _context.Add(courseTask);
            _context.SaveChanges();
            return(courseTask);
        }