Implementing INotifyPropertyChanged by hand.

PersonViewModelByHand.cs

public class PersonViewModel : INotifyPropertyChanged
{
  private string _name;

  public event PropertyChangedEventHandler PropertyChanged;

  public string Name
  {
    get
    {
      return _name;
    }
    set
    {
      _name = value;
      NotifyViewableProperty("Name");
    }
  }

  private void NotifyViewableProperty(string propertyName)
  {
    var propertyChanged = this.PropertyChanged;
    if (propertyChanged != null)
    {
      propertyChanged.Invoke(this, 
        new PropertyChangedEventArgs(propertyName));
    }
  }
}