void Main()
{
    dynamic employee = new ExpandoObject();
    ((INotifyPropertyChanged)employee).PropertyChanged +=
        new PropertyChangedEventHandler(HandlePropertyChanges);
    employee.Name = "John Smith";
    employee.Name = "John Smith2";
    var expando = employee as IDictionary<string, Object>;
    expando["Name"] = "John Smith3";
}

private static void HandlePropertyChanges(
    object sender, PropertyChangedEventArgs e)
{
    Console.WriteLine("{0} has changed.", e.PropertyName);
}

// Output:
// Name has changed.
// Name has changed.
// Name has changed.