Data Binding in WPF

To use Data Binding in WPF implement INotifyPropertyChanged (INPC) for your datasource (typically a POCO object) which will serve as the datacontext for your View.

Implementing INPC requires calling an event called PropertyChanged from within your POCO class, whenever one of its property changes. The signature for the event is

public event PropertyChangedEventhandler PropertyChanged;

To call this event, by convention we define a helper method called OnPropertyChanged like so

private void OnPropertyChanged([CallerMemberName] string title="")
{
     if (PropertyChanged != null)
     {
          PropertyChanged(this, new PropertyChangedEventArgs(caller));
      }
}

This helper method should be called from every  property setter in the POCO class and that's how we get  Data Binding in WPF.

private string _title;
public string Title
{
   get { return _title;}
   set {
           _title = value;
           OnPropertyChanged();
         }
}

Simple and neat!  Do ko.observable() and $watch sound familiar?