Performance cost of a try/catch block [duplicate]

Answer 1

I am being told that adding a try catch block adds major performance cost in the order of 1000 times slower than without, in the example of a for loop of a million. Is this true?

Using try catch adds performance cost, but it isn't a major performance cost.

Isn't it best to use try catch block as much as possible?

No, it is best to use try catch block when makes sense.