DataAccessLayer.DataBase.GetComents C# (CSharp) Method

        public List<Comment> GetComents(Guid postId)
        {
            string queryString =
                "SELECT [dbo].comments.text, [dbo].comments.createdtime, comments.accountid, comments.name, comments.comid, comments.postid " +
                "FROM [dbo].comments " +
                "WHERE [dbo].comments.postid = @postid;";

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

                command.Parameters.AddWithValue("postid", postId);

                connection.Open();

                var reader = command.ExecuteReader();
                var list = new List<Comment>();

                if (reader == null)
                    return null;

                while (reader.Read())
                {
                    list.Add(new Comment()
                    { 
                        Text = (string)reader[0],
                        CreatedTime = (DateTime)reader[1],
                        AccountId = (Guid)reader[2],
                        AuthorName = (string)reader[3],
                        ComId = (Guid)reader[4],
                        PostId = (Guid)reader[5]
                    });
                }

                return list;
            }
        }