public class Person : INotifyPropertyChanged
    {
      public event PropertyChangedEventHandler PropertyChanged;
      public string Name { get; set; }
      public void OnNameChanged()
      {
        Debug.WriteLine("Name Changed");
      }
    }

    public class Person : INotifyPropertyChanged
    {
      public event PropertyChangedEventHandler PropertyChanged;
      string name;
      public string Name
      {
        get { return name; }
        set
        {
          if (value != name)
          {
            name = value;
            OnNameChanged();
            OnPropertyChanged("Name");
          }
        }
      }
      public void OnNameChanged()
      {
        Debug.WriteLine("Name Changed");
      }
      public virtual void OnPropertyChanged(string propertyName)
      {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
      }
    }

    public class Person : INotifyPropertyChanged
    {
      public event PropertyChangedEventHandler PropertyChanged;
      [OnChangedMethod(nameof(OnMyNameChanged))]
      public string Name { get; set; }
      private void OnMyNameChanged()
      {
        Debug.WriteLine("Name changed");
      }
    }

    public class Person : INotifyPropertyChanged
    {
      public event PropertyChangedEventHandler PropertyChanged;
      [OnChangedMethod(nameof(OnName1Changed))]
      public string Name1 { get; set; }
      private void OnName1Changed(object oldValue, object newValue)
      {
        Debug.WriteLine("Name Changed:" + oldValue + " => " + newValue);
      }
      [OnChangedMethod(nameof(OnName2Changed))]
      public string Name2 { get; set; }
      private void OnName2Changed(string oldValue, string newValue)
      {
        Debug.WriteLine("Name Changed:" + oldValue + " => " + newValue);
      }
    }