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Editorial Team
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Asked: 2026-05-11T19:31:17+00:00

When I close my C# application, I am getting the a windows sound that

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When I close my C# application, I am getting the a windows sound that indicates an error. However, when I debug through the close process, I get all the way back up into the Program class…

It gets past Application.Run(..), exits the static void Main() function, and then makes the error noise.

Other than the noise there is nothing indicative of an error. I don’t even know where to begin looking! Any ideas?

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1 Answer

  1. Editorial Team

    Something is going wrong in the cleanup, that could be very hard to find. There are two ways to attack this:

    Enhance the chances of detecting it while you’re still in control (in Main) by wrapping everything in your Main in a try/catch and add some code after the Application.Run to get as much of the cleanup going as possible. A few things I can think of:

    GC.Collect(); 
GC.WaitForPendingFinalizers();
Thread.Sleep(1000);
GC.Collect(); 
GC.WaitForPendingFinalizers();

    Collect at least 2 times, maybe more. In the same spirit, add a few Application.DoEvents() in the OnClosing of the MainForm.

    The other approach is more dependent on your code, to take a stab in the dark: look for all static fields/properties you can set to null and Disposable objects you can Dispose deterministically on Exit.

    And all this in combination with Fredrik Mörks suggestion for the UnhandledException event.

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