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    <p>Well, <code>catch(Exception ex)</code> is just the same as <code>catch(Exception)</code> with one difference only: in <code>catch(Exception ex)</code> we have an access to the exception class (error cause) instance. Usually you need an exception class instance to print out the original message:</p> <pre><code> try { ... } catch (AppServerException e) { Console.WriteLine("Application server failed to get data with the message:"); Console.WriteLine(e.Message); // &lt;- What's actually got wrong with it } </code></pre> <p>If you don't need the exception class instance, e.g. you plan just to consume the exception, the catch(Exception ex) syntax is excessive and catch(Exception) is prefferable:</p> <pre><code> try { c = a / b; } catch (DivideByZeroException) { c = Int.MaxValue; // &lt;- in case b = 0, let c be the maximum possible int } </code></pre> <p>Finally. <em>Do not catch general Exception class without re-throughing</em>: </p> <pre><code> try { int c = a / b; } catch (Exception) { // &lt;- Never ever do this! Console.WriteLine("Oh NO!!"); } </code></pre> <p>do you really want to code "whatever error (green fume from CPU included) had happend just print out "Oh No" and continue"? The pattern with Exception class is something like this:</p> <pre><code> tran.Start(); try { ... tran.Commit(); } catch (Exception) { // Whatever had happened, let's first rollback the database transaction tran.Rollback(); Console.WriteLine("Oh NO!"); throw; // &lt;- re-throw the exception } </code></pre>
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    1. COI disagree with '_Do not catch general Exception class without re-throwing'_. and _'Do you really want to code "whatever error" just print out "Oh No" and continue?'. 1. Sometimes I do 2. There are other things I may want to do (besides logging). It is common to catch `Exception ex` in code.
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    2. COIt's `DivideByZeroException` not `ZeroDivisonException` afaik.
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