public ActionResult SolutionEdit(SolutionModel model, HttpPostedFileBase upload)
        {
            CourseServices cs            = new CourseServices();
            UserServices   us            = new UserServices();
            HttpCookie     loggedStudent = Request.Cookies["LoggedUser"];

            model.Student   = us.GetStudent(loggedStudent.Values.Get("Login"));
            model.StudentId = model.Student.IdUcznia;
            model.FileName  = upload.FileName;
            using (var reader = new System.IO.BinaryReader(upload.InputStream))
            {
                model.Solution = reader.ReadBytes(upload.ContentLength);
            }
            cs.SolutionEdit(model);
            return(RedirectToAction("TaskList", new { CourseId = cs.GetTask(model.TaskId).CourseId }));
        }