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    <p>Are you catching exceptions that you want to then filter more carefully, so you can then change your mind, decide not to handle them and so rethrow them?</p> <p>If you want to be really careful about this, that's not really a good idea. It's better to never catch the exception in the first place. The reason is that a given <code>try/catch</code> handler should not take the decision to run nested <code>finally</code> blocks for exceptions that it is not expecting to see. For example, if there is a <code>NullReferenceException</code>, it's probably a very bad idea to continue executing any code as it will probably cause another such exception to be thrown. And <code>finally</code> blocks are just code, like any other code. As soon as an exception is caught for the first time, any <code>finally</code> blocks on the stack beneath the <code>try/catch</code> will be executed, by which time it's too late - another exception may be generated, and this means that the original exception is lost.</p> <p>This implies (in C#) that you have to careful write out a separate <code>catch</code> handler for all the exception types you want to catch. It also implies that you can only filter by exception type. This is sometimes very hard advice to follow.</p> <p>It should be possible to filter exceptions in other ways, but in C# it is not. However, it is possible in VB.NET, and the BCL itself takes advantage of this by having a small amount of code written in VB.NET so it can filter exceptions in a more convenient way.</p> <p><a href="https://web.archive.org/web/20091218171254/http://blogs.msdn.com/clrteam/archive/2009/02/05/catch-rethrow-and-filters-why-you-should-care.aspx" rel="nofollow noreferrer">Here's a detailed explanation, with a VB.NET code sample, from the CLR team blog.</a></p> <p><a href="http://incrediblejourneysintotheknown.blogspot.com/2009/02/fatal-exceptions-and-why-vbnet-has.html" rel="nofollow noreferrer">And here's my two cents.</a></p>
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    1. POHow to throw exception without resetting stack trace?
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    1. USDaniel Earwicker
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    1. CO"Are you catching exceptions that you want to then filter more carefully, so you can then change your mind, decide not to handle them and so rethrow them?" -> Yes.
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      1. USSung Kim
    2. CO"finally" code is always executed, no matter whether an exception occurred and how you handle the exception. I don't see the relation to the question...
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      1. USLucero
    3. CO+1 for the link.. a useful thing that VB has and C# doesn't... strange. Maybe its because the C# designers want you to catch specific exceptions and design exception hierarchies correctly so that you dont have to catch and rethrow few specific derivations
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      1. USGishu
 

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