public void addMovie(int id, String movietitle)
        {
            RentInfo newmovie = new RentInfo()
            {
                movieID    = id,
                movieTitle = movietitle
            };

            if (id <= 0 || movietitle == "")
            {
                MessageBox.Show("ID and movie title are required");
            }
            else
            {
                RentalInfoModel.AddMovie(newmovie);
            }
        }
 internal void returnMovie(RentMovie rentMovie)
 {
     RentalInfoModel.returnMovie(rentMovie);
 }