private void SaveToFile(ScoreContainer container)
 {
     using (var sw = new StreamWriter(FilePath))
     {
         var obj = JsonConvert.SerializeObject(container, Formatting.Indented);
         sw.WriteLine(obj);
     }
 }
        public void Store(string playerId, Score score)
        {
            if (File.Exists(FilePath))
            {
                ScoreContainer scoreContainer = null;

                using (var sr = new StreamReader(FilePath))
                {
                    var text = sr.ReadToEnd();

                    try
                    {
                        scoreContainer = JsonConvert.DeserializeObject <ScoreContainer>(text);
                    }
                    catch (Exception e)
                    {
                        scoreContainer = new ScoreContainer();
                    }
                }

                if (scoreContainer == null)
                {
                    scoreContainer = new ScoreContainer();
                }

                scoreContainer.Add(playerId, score);
                SaveToFile(scoreContainer);
            }
            else
            {
                var scoreContainer = new ScoreContainer();
                scoreContainer.Add(playerId, score);

                SaveToFile(scoreContainer);
            }
        }