Interview Questions on Exception Handling

FAQS on Exception Handling

C#.NET FAQS	Exception Handling
1. What is an Exception?
An exception is an event, which occurs during the execution of a program, that disrupts the normal flow of the program's instructions.
2. What are the different approaches to handle exceptions in asp.net web application?
Use exception-handling structures to deal with exceptions within the scope of a procedure. try { -- } catch { -- } finally { -- } Use error events to deal with exceptions within the scope of an object. Page_Error - The Page_Error event handler provides a way to trap errors that occur at the page level. Application_Error - Application_Error event handler to trap errors that occur at the application level. Custom error pages to display custom error pages for unhandled exceptions at application level.
3. What will happen if an exception occur inside try block?
If a code in a try block causes an exception, control flow passes to immediate catch or finally block.
4. Will the finally block get executed, if an exception doesn't occurs?
Yes, a finally block will always be executed irrespective of whether an exception has occured or not.
5. What is the main use of finally block in exception handling?
Finally block is mainly used to free resources used within the try block.(Ex: closing db connections, and file connection ...)
C#.NET FAQS	Exception Handling