DataAccessLayer.DataBase.GetLikes C# (CSharp) Method

        public Dictionary<bool, int> GetLikes(Guid postId, Guid accountId)
        {
            var queryString =
                "SELECT [dbo].posts.rating, [dbo].Likes.likeid " +
                "FROM [dbo].posts, [dbo].Likes " +
                "WHERE ([dbo].posts.postid = @postid) AND " +
                "([dbo].Likes.accountid = @accountid) AND ([dbo].Likes.postid = @postid);";

            using (SqlConnection connection = new SqlConnection(_connectionString))
            {
                var command = new SqlCommand(queryString, connection);

                command.Parameters.AddWithValue("accountid", accountId);
                command.Parameters.AddWithValue("postid", postId);
                connection.Open();

                var reader = command.ExecuteReader();
                Dictionary<bool, int> toReturn;
                Guid guid = Guid.Empty;
                int rating = 0;

                while (reader.Read())
                {
                    rating = (int)reader[0];
                    guid = (Guid)reader[1];
                }

                if ((guid != Guid.Empty) && (rating >= 0))
                {
                    toReturn = new Dictionary<bool, int>();
                    toReturn.Add(true, rating);
                    return toReturn;
                }
                else
                {
                    toReturn = new Dictionary<bool, int>();
                    toReturn.Add(false, rating);
                    return toReturn;
                }
            }
        }