exception handling in c#

Question

i want to know do finally block still execute in exception handling even if there is no matching catch block for the try block and if not then what happens? Also i want to now system exception and application difference

Answer 1

Yes. finally blocks execute no matter what (barring some sort of catastrophic failure that terminates the program, obviously). Having a catch block is irrelevant.

In the event of an exception, these bits of code will run:

1. Everything in the try up to where the exception is thrown
2. Everything in the catch (could be nothing, of course)
3. Everything in the finally

Answer 2

Yes, you do not need a catch block at all. The finally block always executes.

As to the difference between System.Exception and System.ApplicationException: Exception is the base class for all exceptions; ApplicationException should be used when a non-fatal application error occurs. See the MSDN documentation.

Also see best practices for handling exceptions.

Answer 3

As others mentioned finally will run even if there is no catch block. This supports Java's try finally pattern (which can be achieved using IDisposable and using).

One exception _{(see what I did there?)} is when a StackOverflowException is thrown in which case the finally block will not run (nor would a catch if one were present).

The finally block runs after the try block completes (either cleanly or by throwing an exception) as you would expect from its location in the code.