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Editorial Team
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Asked: 2026-05-12T19:38:30+00:00

Suppose I have thread 1, the main window UI thread and thread 2, a

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Suppose I have thread 1, the main window UI thread and thread 2, a login UI thread that is modal form.

Now thread 1 executes a piece of code and wants to change a UI element in the login form so it invokes a delegate to change something in thread 2. But when it does so, the login form becomes hidden behind the main window and there’s no way for me to bring it back. Selecting it on the taskbar doesn’t do anything and writing “Activate()” at the end of the invoked method doesn’t do anything either.

How can I keep thread 2’s UI from becoming hidden?

Thanks

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1 Answer

  1. Editorial Team

    Call Focus() on your login form after you invoke to update the main window. Also it may help to set the parent window of the login form to be the main window when you display it.

    (in your main UI class)

    using (YourLoginForm f = new YourLoginForm()){

    YourLoginForm.Show(this)
}

    Another approach may be to use ShowDialog() instead of Show(), and have your login form return a different DialogResult depending on whether the login was successful or not. ShowDialog() should automatically set your login form to be modal and have the focus.

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