What is the difference between observable collections and innumberable ones?

An observable collection implements the famous "Observer" design pattern. It is one of the design patterns that are listed in the famous book of the GOF The basic idea is as follows - if several objects has some dependency on the same object, such that when some interesting things happen inside that object, all those dependent objects should be notified about the event immediately, then this pattern is used. Here we call the dependent objects as the "Observer", and the objects onto which they all are depending as "Subject".

When some event happens inside the subject, it is the responsibility of the subject to notify all the observers about this event. To facilitate this sort of message passing, all the observers has to subscribe to the subject when they are created. Details can be found here.

An observable collection implements the famous "Observer" design pattern. It is one of the design patterns that are listed in the famous book of the GOF. The basic idea is as follows - if several objects has some dependency on the same object, such that when some interesting things happen inside that object, all those dependent objects should be notified about the event immediately, then this pattern is used.

Here we call the dependent objects as the "Observer", and the objects onto which they all are depending as "Subject". When some event happens inside the subject, it is the responsibility of the subject to notify all the observers about this event. To facilitate this sort of message passing, all the observers has to subscribe to the subject when they are created.

Details can be found here.

Thanks for your simple explanation it makes sense – user281674 Mar 18 '10 at 18:51 you are welcome :) – Sayem Ahmed Mar 19 '10 at 8:07.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.