How and where do we write try catch block to handle Exception?

You should only handle exceptions when you expect them and want to do something with specific ones. Otherwise, IMO, it is better to let them bubble up the layers so you have a complete stack trace. Even in the presentation tier, I'd be inclined to let errors bubble up (i.e.

Go to a friendly error screen) unless it was an exception I was specifically expecting.

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.