public void Add(string file)
        {
            // Limit number of recent files to 5
            if (RecentFiles.Count > 4)
            {
                RecentFiles.RemoveAt(0);
            }

            var newFile = new RecentFile()
            {
                FileName     = Path.GetFileName(file),
                FullFilePath = file
            };

            var recentFile = RecentFiles.FirstOrDefault(t => t.FullFilePath == newFile.FullFilePath);

            if (recentFile != null)
            {
                RecentFiles.Remove(recentFile);
            }

            RecentFiles.Add(newFile);

            var serializedRecentFiles = ConfigurationSerializer.SerializeObject(RecentFiles, new Type [] {});

            ApplicationLocalStorageHelper.WriteToFile(RECENTFILESSTORENAME, serializedRecentFiles);
        }
        public RecentFilesList()
        {
            RecentFiles = new ObservableCollection <RecentFile>();

            var serializedRecentFiles = ApplicationLocalStorageHelper.ReadFrom(RECENTFILESSTORENAME);

            if (!string.IsNullOrEmpty(serializedRecentFiles))
            {
                RecentFiles = (ObservableCollection <RecentFile>)ConfigurationSerializer.DeserializeObject(serializedRecentFiles, typeof(ObservableCollection <RecentFile>), new Type [] {});
            }
        }