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    <p>If this is a Windows Forms app, then it's likely that the unhandled exception is being caught by the window message pump, which is why you never see it. To deal with this, see <a href="https://stackoverflow.com/questions/233255/how-does-setunhandledexceptionfilter-work-in-net-winforms-applications#238357">my answer here</a>.</p> <p>If it's a Windows service, then the exception might be appearing on a background thread and not being marshalled back to your main thread. To deal with this, you need to marshal any background thread back to your main thread, and the exception will be re-thrown there so that you can catch it. </p> <p>If it's a console app, then I'm a bit mystified.</p> <p><strong>EDIT</strong>: Your comment says this is a Windows Forms app. In that case, you're probably not seeing the exception because it's being handled by the built-in Windows Forms exception handler that does the following by default:</p> <ul> <li>Catches an unhandled managed exception when: <ul> <li>no debugger attached, and</li> <li>exception occurs during window message processing, and</li> <li>jitDebugging = false in App.Config.</li> </ul></li> <li>Shows dialog to user and prevents app termination.</li> </ul> <p>You can disable this behaviour by setting jitDebugging = true in App.Config. Then you should be able to see the unhandled exception by registering for the event Application.ThreadException, e.g. in C#:</p> <pre><code>Application.ThreadException += new Threading.ThreadExceptionHandler(CatchExceptions); </code></pre>
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