private static void RunWithRx() { var person = new RxPerson { Name = "Erik" }; // Subscribe to listen to changes var subscription = person.PropertyChanged .Where(x => x.NewValue.Length > 4) .Subscribe(e => { Console.WriteLine(e.NewValue); }); // Change the name person.Name = "Bart"; person.Name = "Matthew"; person.Name = "Matthew"; person.Name = "Steve"; subscription.Dispose(); person.Name = "Bill"; }