public void CreateRating(int customerID, int rating, int movieID)
        {
            using (CinemaEntities database = new CinemaEntities())
            {
                Rating newRating = database.Rating.Create();

                //obecna data
                DateTime myDateTime = DateTime.Now;
                //format daty poprawny do sql
                string sqlFormattedDate = myDateTime.ToString("yyyy-MM-dd HH:mm");

                newRating.Rating_ID   = Convert.ToInt32(database.sp_getSeqRatingID().FirstOrDefault());
                newRating.Customer_ID = customerID;
                newRating.Movie_ID    = movieID;
                newRating.Stars       = rating;
                newRating.Date        = DateTime.Parse(sqlFormattedDate);

                database.Rating.Add(newRating);
                database.SaveChanges();
            }
        }