Why catch and rethrow an exception in C#?

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First; the way that the code in the article does it is evil. throw ex will reset the call stack in the exception to the point where this throw statement is; losing the information about where the exception actually was created.

Second, if you just catch and re-throw like that, I see no added value, the code example above would be just as good (or, given the throw ex bit, even better) without the try-catch.

However, there are cases where you might want to catch and rethrow an exception. Logging could be one of them:

try 
{
    // code that may throw exceptions    
}
catch(Exception ex) 
{
    // add error logging here
    throw;
}

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