title: Is there any in-built way to implement change notification of between 2 objects other than events and delegates?
body: <p>I have 2 class, say Class A with some properties and Class B with some properties. If a property in Class A is modified, I want to update a property in Class B and also I want to update the result to other property in Class A again. </p>
  
  <p>Is there any way to do it without using Events?</p>