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PO
 

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    <p>There are a few exceptions that have been defined as "unrecoverable". One of them is <code>MissingMethodException</code>, because if a method is missing in a class, this is a severe error and it requires unloading the class and reloading a new class to recover, which cannot be done trivially (if at all). </p> <p>To recover, you need to reinstall, check the versions of the assemblies, check whether the PE images are valid etc.</p> <p>If all you want to know is whether SP2 is installed, the default method is using a bootstrap application which simply checks the installed version. If all's fine, it runs the application, if not it shows a nice message.</p> <hr> <p><strong>Update requested by OP:</strong><br> Other exceptions that are either hard to catch or uncatchable (may depend on your version of .NET, i.e., .NET 4.0 added more uncatchables): <code>OutOfMemoryException</code> (can be caught when it is synchronous), <code>StackOverflowException</code> (can never be caught), <code>ThreadAbortException</code> (can be caught, but is special because it will automatically be reraised at the end of the catch-block), <code>BadImageFormatException</code> and <code>MissingManifestResourceException</code> if you'd try to catch it in the assembly throwing the exception (if you load it dynamically, same as with <code>MissingMethodException</code>, you are capable of catching it). And in general, any exception that does not inherit from <code>Exception</code> is hard to catch (but you can catch them with a generic try/catch block).</p> <p>There are others, but the first three above are the ones you'll encounter most often in practice.</p>
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    1. POWhy is it not possible to catch MissingMethodException?
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    1. COcould you please list other 'unrecoverable' exception types?
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      1. USMarek
    2. CO@Marek: done, I updated the answer.
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    3. CODo you have a reference for these "unrecoverable" exceptions? I see it is referred to in [Application.DispatcherUnhandledException](http://msdn.microsoft.com/en-us/library/system.windows.application.dispatcherunhandledexception%28v=vs.85%29.aspx), but I cannot find definitive information.
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      1. USOliver Bock
 

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