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Editorial Team
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Asked: 2026-06-11T18:51:25+00:00

According to MSDN Dispose will be called automatically if the form is shown using

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According to MSDN

Dispose will be called automatically if the form is shown using the
Show method. If another method such as ShowDialog is used, or the form
is never shown at all, you must call Dispose yourself within your
application.

What happens if I launch a form via

System.Windows.Forms.Application.Run(form);?

Closing the form allows execution to continue. If I call form.ShowDialogue() after the block it throws up an ObjectDisposedException. To be sure, do I need to call form.Dispose() when launching a form via Application.Run() or is there any advantage or disadvantage to doing so?

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1 Answer

  1. Editorial Team

    The ApplicationContext class controls the lifetime of the UI thread. Its ExitThread() method initiates a shutdown that exits the internal message loop. When you use the Application.Run(Form) overload then Winforms creates an ApplicationContext with the ApplicationContext(Form) constructor. Which subscribes the form’s HandleDestroyed event, the event handler calls ExitThread().

    So the lifetime is purely based on whether the native Windows window for the form is alive. The two common ways to destroy that window is the user clicking the window’s Close button or your app calling the Close or Dispose methods. Either way, the form is automatically disposed. The form object is dead after this, trying to revive it throws ODE.

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