How to subscribe to certain properties event
<p>I have an object that has many properties. Each time a property changes an event is raised. For performance issue, I want in the view model to subscribe to certain properties event without changing the business object.</p>

<p>I know I can check for the property name in the event handler. But I don't want to go this route since it is a complicated business that have too many properties.</p>

<p>For more clarification, lets say I have the Car class with these properties.
I want to listen to the events of property A,D,G and I want to ignore the rest.</p>

<p>Thank you</p>

<pre><code>class Car : INotifyPropertyChanged
{
 public string A {get {...} set {...}}
 public string B {get {...} set {...}}
 public string C {get {...} set {...}}
 public string D {get {...} set {...}}
 public int E {get {...} set {...}}
 public int F {get {...} set {...}}
 public int G {get {...} set {...}}

 ...
}
</code></pre>