The purpose of the try, catch, and finally blocks is to trap unexpected exceptions. A common usage is to obtain and use resources in a try block, trap exceptional circumstances in a catch block, and release the resources in the finally block. With a combination of input validation controls and keeping expected errors in mind while coding, the use of try-catch-finally can minimize the possibility of an ASP.NET application crashing.
Try Clause
- The try block encloses the code being executed.
- The exceptions may be thrown on completion of this block.
- There is only one Try block per try-catch-finally combination.
Catch Clause
- The catch blocks are optional.
- Thess blocks catches the exceptions.
- The catch blocks are executed only if exceptions occur.
- The catch blocks may be defined without arguments though not recommended.
- It is suggested to have the object argument derived from System.Exception
- There may be more than one specific catch clause in the same try-catch statement.
Finally Clause
- The finally block is optional.
- When used, finally block is executed without fail.
