Try, Catch (and Finally)

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.