public async Task <IActionResult> Edit(int id, [Bind("Id,StudentId,CourseId,Semester,Year,Grade,SeminarUrl,ProjectUrl,ExamPoints,SeminarPoints,ProjectPoints,AdditionalPoints,FinishDate")] Enrollment enrollment)
        {
            if (id != enrollment.Id)
            {
                return(NotFound());
            }

            if (ModelState.IsValid)
            {
                try
                {
                    _context.Update(enrollment);
                    await _context.SaveChangesAsync();
                }
                catch (DbUpdateConcurrencyException)
                {
                    if (!EnrollmentExists(enrollment.Id))
                    {
                        return(NotFound());
                    }
                    else
                    {
                        throw;
                    }
                }
                return(RedirectToAction(nameof(Index)));
            }
            ViewData["CourseId"]  = new SelectList(_context.Course, "Id", "Title", enrollment.CourseId);
            ViewData["StudentId"] = new SelectList(_context.Student, "Id", "FullName", enrollment.StudentId);
            return(View(enrollment));
        }
        public async Task <IActionResult> Edit(int id, IFormFile imageUrl, [Bind("Id,StudentId,FirstName,LastName,EnrollmentDate,AcquiredCredits,CurrentSemester,EducationLevel")] Student student)
        {
            if (id != student.Id)
            {
                return(NotFound());
            }

            StudentsController uploadImage = new StudentsController(_context, webHostingEnvironment);

            student.profilePicture = uploadImage.UploadedFile(imageUrl);

            if (ModelState.IsValid)
            {
                try
                {
                    _context.Update(student);
                    await _context.SaveChangesAsync();
                }
                catch (DbUpdateConcurrencyException)
                {
                    if (!StudentExists(student.Id))
                    {
                        return(NotFound());
                    }
                    else
                    {
                        throw;
                    }
                }
                return(RedirectToAction(nameof(Index)));
            }
            return(View(student));
        }
        public async Task <IActionResult> Edit(int id, IFormFile imageUrl, [Bind("Id,FirstName,LastName,Degree,AcademicRank,OfficeNumber,HireDate")] Teacher teacher)
        {
            if (id != teacher.Id)
            {
                return(NotFound());
            }
            TeachersController uploadImage = new TeachersController(_context, webHostEnvironment);

            teacher.profilePicture = uploadImage.UploadedFile(imageUrl);
            if (ModelState.IsValid)
            {
                try
                {
                    _context.Update(teacher);
                    await _context.SaveChangesAsync();
                }
                catch (DbUpdateConcurrencyException)
                {
                    if (!TeacherExists(teacher.Id))
                    {
                        return(NotFound());
                    }
                    else
                    {
                        throw;
                    }
                }
                return(RedirectToAction(nameof(Index)));
            }
            return(View(teacher));
        }
        public async Task <IActionResult> Edit(int id, CourseStudentEditViewModel viewmodel)
        {
            if (id != viewmodel.Course.Id)
            {
                return(NotFound());
            }

            if (ModelState.IsValid)
            {
                try
                {
                    _context.Update(viewmodel.Course);
                    await _context.SaveChangesAsync();

                    IEnumerable <int>       listStudents = viewmodel.SelectedStudents;
                    IQueryable <Enrollment> toBeRemoved  = _context.Enrollment.Where(s => !listStudents.Contains(s.StudentId) && s.CourseId == id);
                    _context.Enrollment.RemoveRange(toBeRemoved);
                    IEnumerable <int> existStudents = _context.Enrollment.Where(s => listStudents.Contains(s.StudentId) && s.CourseId == id).Select(s => s.StudentId);
                    IEnumerable <int> newStudents   = listStudents.Where(s => !existStudents.Contains(s));
                    foreach (int studentId in newStudents)
                    {
                        _context.Enrollment.Add(new Enrollment {
                            StudentId = studentId, CourseId = id
                        });
                    }

                    await _context.SaveChangesAsync();
                }
                catch (DbUpdateConcurrencyException)
                {
                    if (!CourseExists(viewmodel.Course.Id))
                    {
                        return(NotFound());
                    }
                    else
                    {
                        throw;
                    }
                }
                return(RedirectToAction(nameof(Index)));
            }
            ViewData["FirstTeacherId"]  = new SelectList(_context.Set <Teacher>(), "Id", "FullName", viewmodel.Course.FirstTeacherId);
            ViewData["SecondTeacherId"] = new SelectList(_context.Set <Teacher>(), "Id", "FullName", viewmodel.Course.SecondTeacherId);
            return(View(viewmodel));
        }