public async Task <IActionResult> Create([Bind("Id,Name,Surname,ClassId")] Student student)
        {
            if (ModelState.IsValid)
            {
                _context.Add(student);
                await _context.SaveChangesAsync();

                return(RedirectToAction(nameof(Index)));
            }
            ViewData["ClassId"] = new SelectList(_context.Class, "Id", "Id", student.ClassId);
            return(View(student));
        }
        public async Task <IActionResult> Create([Bind("Id,Value,Description,StudentId")] Mark mark)
        {
            if (ModelState.IsValid)
            {
                _context.Add(mark);
                await _context.SaveChangesAsync();

                return(RedirectToAction(nameof(Index)));
            }
            ViewData["StudentId"] = new SelectList(_context.Student, "Id", "Id", mark.StudentId);
            return(View(mark));
        }