Implementing INotifyPropertyChanged

It's changed a lot over the years. Here is the latest iteration that I use.

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   1 private ObservableCollection<string> _Area = new ObservableCollection<string>();
   2 public ObservableCollection<string> Area
   3 {
   4     get => _Area;
   5     set => SetField(ref _Area, value);
   6 }
   7 
   8 //...
   9 
  10 public event PropertyChangedEventHandler PropertyChanged;
  11 
  12 protected void SetField<T>(ref T field, T value, [CallerMemberName] string propertyName = null)
  13 {
  14     field = value;
  15     PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
  16 }