public static Contest IsContestValid(IContestsData context, User creator, int contestId)
        {
            var contest = context.Contests.All()
                .FirstOrDefault(c => c.IsActive && c.Id == contestId);

            if (contest != null)
            {
                if (contest.ParticipationType == ParticipationType.Open && !HttpContext.Current.User.Identity.IsAuthenticated)
                {
                    return null;
                }

                if (contest.ParticipationType == ParticipationType.Closed && !(contest.Participants.Any(p => p.Id == creator.Id)))
                {
                    return null;
                }

                if (contest.DeadlineType == DeadlineType.ByParticipants && (contest.Photos.DistinctBy(p => p.OwnerId).Count() > contest.ParticipantsNumberDeadline))
                {
                    return null;
                }

                if (contest.DeadlineType == DeadlineType.ByTime && DateTime.Now >= contest.DeadLine)
                {
                    return null;
                }
            }

            return contest;
        }
        public static UserEditBindingModel CreateFromUser(User user)
        {
            var newUser = new UserEditBindingModel()
            {
                UserName = user.UserName,
                FullName = user.FullName,
                Email = user.Email,
                PhoneNumber = user.PhoneNumber,
                Upload = null,
                RegisteredOn = user.RegisteredOn,
                ProfilePhotoPath = user.ProfilePhotoPath,
                ThumbnailPath = user.ThumbnailPath,
                ProfilePhotoUrl = user.ProfilePhotoUrl,
                ThumbnailUrl = user.ThumbnailUrl
            };

            return newUser;
        }