public ActionResult RegisterDean(RegDean FormRegUser, HttpPostedFileBase Avatar)
        {
            using (DiplomEntities5 dc = new DiplomEntities5())
            {
                var anyUserEmail = dc.Users.Any(a => a.Email.Equals(FormRegUser.Email));
                if (anyUserEmail)
                {
                    ModelState.AddModelError("Email", "Пользователь с таким email уже зарегистрирован");
                }

                var anyUserLogin = dc.Users.Any(a => a.Login.Equals(FormRegUser.Login));
                if (anyUserLogin)
                {
                    ModelState.AddModelError("Login", "Пользователь с таким логином уже зарегистрирован");
                }
                if (FormRegUser.Captcha != (string)Session[CaptchaImage.CaptchaValueKey])
                {
                    ModelState.AddModelError("Captcha", "Текст с картинки введён не верно");
                    return View(FormRegUser);
                }
                if (ModelState.IsValid == true)
                {
                    MemoryStream memory = new MemoryStream();
                    if (Avatar == null)
                    {
                        Bitmap avatar = new Bitmap(Server.MapPath("~/Content/Avatars/default_avatar.gif"));
                        avatar.Save(memory, ImageFormat.Gif);
                    }
                    else
                    {
                        string fileName = System.IO.Path.GetFileName(Avatar.FileName);
                        Avatar.SaveAs(Server.MapPath("~/Content/Avatars/" + fileName));
                        Avatar.InputStream.CopyTo(memory);
                    }
                    Users UserToSave = new Users();
                    UserToSave.Name = FormRegUser.Name;
                    UserToSave.Sirname = FormRegUser.Sirname;
                    UserToSave.Patername = FormRegUser.Patername;
                    UserToSave.Password = FormRegUser.Password;
                    UserToSave.RoleId = FormRegUser.RoleId;
                    UserToSave.Group = FormRegUser.Group;
                    UserToSave.Login = FormRegUser.Login;
                    UserToSave.Course = FormRegUser.Course;
                    UserToSave.Email = FormRegUser.Email;
                    UserToSave.Avatar = memory.GetBuffer();
                    UserToSave.Birthday = FormRegUser.Birthday;
                    dc.Users.Add(UserToSave);
                    dc.SaveChanges();
                    ModelState.Clear();
                    FormRegUser = null;
                    ViewBag.Message = "Регистрация прошла успешно";
                }
            }
            return View(FormRegUser);
        }
        public ActionResult Register(RegUser FormRegUser, HttpPostedFileBase Avatar)
        {
            using (DiplomEntities5 dc = new DiplomEntities5())
            {
                var anyUserEmail = dc.Users.Any(a => a.Email.Equals(FormRegUser.Email));
                if (anyUserEmail)
                {
                    ModelState.AddModelError("Email", "Пользователь с таким email уже зарегистрирован");
                }

                var anyUserLogin = dc.Users.Any(a => a.Login.Equals(FormRegUser.Login));
                if (anyUserLogin)
                {
                    ModelState.AddModelError("Login", "Пользователь с таким логином уже зарегистрирован");
                }
                if (FormRegUser.Captcha != (string)Session[CaptchaImage.CaptchaValueKey])
                {
                    ModelState.AddModelError("Captcha", "Текст с картинки введён не верно");
                    return View(FormRegUser);
                }

                DateTime now = DateTime.Now;
                int RegUserCourse = now.Year - (Convert.ToInt32(FormRegUser.Login.ToString().Substring(0, 2)) + 2000);
                foreach (Users student in dc.Users)
                {
                    int yearFromLogin = Convert.ToInt32(student.Login.ToString().Substring(0, 2));
                    if ((yearFromLogin != RegUserCourse) && (FormRegUser.Course == student.Course))
                    {
                        ModelState.AddModelError("Login", "Ошибка системы. Для решения проблемы обратитесь к методисту");
                        return View(FormRegUser);
                    }
                }
                if(ModelState.IsValid == true)
                {
                    

                    MemoryStream memory = new MemoryStream();
                    if (Avatar == null)
                    {
                        Bitmap avatar = new Bitmap(Server.MapPath("~/Content/Avatars/default_avatar.gif"));
                        avatar.Save(memory, ImageFormat.Gif);
                    }
                    else
                    {
                        string fileName = System.IO.Path.GetFileName(Avatar.FileName);
                        Avatar.SaveAs(Server.MapPath("~/Content/Avatars/" + fileName));
                        Avatar.InputStream.CopyTo(memory);
                    }
                    Users UserToSave = new Users();
                    UserToSave.Name = FormRegUser.Name;
                    UserToSave.Sirname = FormRegUser.Sirname;
                    UserToSave.Patername = FormRegUser.Patername;
                    UserToSave.Password = FormRegUser.Password;
                    UserToSave.RoleId = FormRegUser.RoleId;
                    UserToSave.Group = FormRegUser.Group;
                    UserToSave.Login = FormRegUser.Login;
                    UserToSave.Course = FormRegUser.Course;
                    UserToSave.Email = FormRegUser.Email;
                    UserToSave.Avatar = memory.GetBuffer();
                    UserToSave.Birthday = FormRegUser.Birthday;
                        dc.Users.Add(UserToSave);
                        dc.SaveChanges();
                        ModelState.Clear();
                        FormRegUser = null;
                        ViewBag.Message = "Регистрация прошла успешно";
                }
            }
            return View(FormRegUser);
        }