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    <p>In my experience, I only see this issue when I'm running with a debugger attached. The application behaves the same when run standalone: the exception is not swallowed.</p> <p>With the introduction of <a href="http://support.microsoft.com/kb/976038" rel="noreferrer">KB976038</a>, you can make this work as you'd expect again. I never installed the hotfix, so I'm assuming it came as part of Win7 SP1.</p> <p>This was mentioned in this post:</p> <ul> <li><a href="http://blog.paulbetts.org/index.php/2010/07/20/the-case-of-the-disappearing-onload-exception-user-mode-callback-exceptions-in-x64/" rel="noreferrer">The case of the disappearing OnLoad exception – user-mode callback exceptions in x64</a></li> </ul> <p>Here's some code that will enable the hotfix:</p> <pre><code>public static class Kernel32 { public const uint PROCESS_CALLBACK_FILTER_ENABLED = 0x1; [DllImport("Kernel32.dll")] public static extern bool SetProcessUserModeExceptionPolicy(UInt32 dwFlags); [DllImport("Kernel32.dll")] public static extern bool GetProcessUserModeExceptionPolicy(out UInt32 lpFlags); public static void DisableUMCallbackFilter() { uint flags; GetProcessUserModeExceptionPolicy(out flags); flags &amp;= ~PROCESS_CALLBACK_FILTER_ENABLED; SetProcessUserModeExceptionPolicy(flags); } } </code></pre> <p>Call it at the beginning of your application:</p> <pre><code> [STAThread] static void Main() { Kernel32.DisableUMCallbackFilter(); Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false); Application.Run(new Form1()); } </code></pre> <p>I've confirmed (with the the simple example shown below) that this works, just as you'd expect.</p> <pre><code>protected override void OnLoad(EventArgs e) { throw new Exception("BOOM"); // This will now get caught. } </code></pre> <p>So, what I don't understand, is why it was previously impossible for the debugger to handle crossing kernel-mode stack frames, but with this hotfix, they somehow figured it out.</p>
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    1. POVS2010 does not show unhandled exception message in a WinForms Application on a 64-bit version of Windows
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    1. USJonathon Reinhart
    1. USJonathon Reinhart
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    1. CO`Set/GetProcessUserModeExceptionPolicy` are still not documented on MSDN, and Kernel32.dll of Windows 8 does not export them.
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      1. USMartin
    2. COIsn't there a way to do the same thing by editing the registry or something?
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      1. USThunderGr
    3. COI have read them. I also read the comment that windows 8 kernel do not export these methods. I happen to run on windows 8. I was just asking, just in case.
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