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Editorial Team
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Asked: 2026-06-12T12:12:19+00:00

First I want to explain what I’m going to do: I’m developing a Learning

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First I want to explain what I’m going to do: I’m developing a Learning application to show some cards to the students. I have CardPack class that is a group of cards.

For licensing the card packs I want to get an ID from user then I’ve created a windows to get RegisterKey from user. this is my GetRegisterKey("CardPackName") method:

    public static string GetRegisterKey(string name)
    {
        GetRegisterKey grk = new GetRegisterKey(name);
        grk.ShowDialog();
        return grk.Key;
    }

but after grk.ShowDialog(); runs the program going to exit and I don’t know why! Can anybody help me to resolve this problem?!?

Update

I tried to create a new instance of GetRegisterKey in Windows_loaded event of MainWindows and I called grk.ShowDialog() and it worked fine and the program didn’t close. I don’t know what’s the source of my problem!

But I found out that the problem isn’t from GetRegisterKey then I’ll remove it’s code from the question.

Update2

I put a break point in return grk.Key; line to check if it runs but it didn’t run and the program closed!

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1 Answer

  1. Editorial Team

    See Application.ShutDownMode,

    http://msdn.microsoft.com/en-us/library/system.windows.application.shutdownmode.aspx

    Applications stop running only when the Shutdown method of the Application is called. Shut down can occur implicitly or explicitly, as specified by the value of the ShutdownMode property.

    If you set ShutdownMode to OnLastWindowClose, Windows Presentation Foundation (WPF) implicitly calls Shutdown when the last window in an application closes, even if any currently instantiated windows are set as the main window (see MainWindow).

    A ShutdownMode of OnMainWindowClose causes Windows Presentation Foundation (WPF) to implicitly call Shutdown when the MainWindow closes, even if other windows are currently open.

    The lifetime of some applications may not be dependent on when the main window or last window is closed, or may not be dependent on windows at all. For these scenarios you need to set the ShutdownMode property to OnExplicitShutdown, which requires an explicit Shutdown method call to stop the application. Otherwise, the application continues running in the background.

    ShutdownMode can be configured declaratively from XAML or programmatically from code.

    This property is available only from the thread that created the Application object.

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