Error Handling in VB.NET

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Hi everybody
I got a question about "Error Handling" in VB.net
what's the meaning of "Throw Exception" and "Throw new Exception"?
and When we should use it?
I understand the using of Try...Catch...Finally
But I don't know the using of "Throw"?

Please help..

Posted 12-Nov-10 4:05am

Layth Rafea

Updated 12-Nov-10 4:15am

Henry Minute

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jim lahey · Answer 1 · 2010-11-12T04:14:00

Solution 1

Throw lets you raise your own exceptions within your application which can then be caught with try..catch. You can also re-throw caught exceptions:

try
{
  myBuggyCode.myFlakyMethod("some parameter bla bla");
}
catch(Exception ex)
{
  logger.Error(ex);

  throw ex;
}

Posted 12-Nov-10 4:14am

jim lahey

Henry Minute · Answer 2 · 2010-11-12T04:20:00

Solution 2

To expand a little on jim's answer.

throw is used to surface an Exception that has already been raised, and often caught in a catch block.

throw new ....
is often used in circumstances like:

C#

if (divisor == 0)
{
  throw new DivideByZeroException("Naughty, naughty");
}

Posted 12-Nov-10 4:20am

Henry Minute