public void GetLandmarkRatings(Landmark landmark, SqlConnection conn)
{
SqlCommand cmd = new SqlCommand("GetLandmarkRatings", conn);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@landmark_id", landmark.ID);
IDataReader reader = cmd.ExecuteReader();
landmark.AddRatings(reader);
reader.Close();
}