Рекомендации по улучшению кода - C#

   class Loader
        {
            public DataSet _data = null;
            public int _streamRecordCount = 0;
            public int _fileRecordCount = 0;
            public int _dbRecordCount = 0;
            public Loader()
            {
                _data = new DataSet();
            }
            public DataSet Data { get { return _data; } }
            public void LoadFromStream(string path)
            {
                Stream stream = new Stream();
                _data.Add(stream.ReadFromStream(path, out _streamRecordCount));
                stream.Close();
            }
            public void LoadFromFile(string path)
            {
                File file = new File();
                _data.Add(file.Read(path, out _fileRecordCount));
                file.Close();
            }
            public void LoadFromDatabase(string connectionString)
            {
                Database db = new Database();
                db.Connect(connectionString);
                _data.Add(db.LoadData(out _dbRecordCount));
                db.Close();
            }
            public string GetResult()
            {
                return "Stream: " + _streamRecordCount.ToString() + "; File: " + _fileRecordCount.ToString() + "; Database: " + _dbRecordCount.ToString() + ";";
            }
        }