public HistoryReadingViewModel(Reading reading, HistorySearchResult parent)
 {
     databaseService = new DatabaseService();
     this.parent     = parent;
     Reading         = reading;
 }
 public HistoryReadingViewModel(Reading reading, HistorySearchResult parent)
 {
     databaseService = new DatabaseService();
     this.parent = parent;
     Reading = reading;
 }