How to close all open and hidden forms in C#

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I have a Splash Screen to my program.
And when the splash end , exec the code

And it works but the splash screen go invisible and when i close the program by my custom exit button it's only closing the current form. But my splash screen is still hidden and appears the app name to task manager. How i can close that currently opened form and the invisible ones with my custom button ?
when i try to start debugging shows error

What I have tried:

C#

this.Hide();
frmLogin o = new frmLogin();
o.show();

Posted 25-May-20 10:23am

Usarsef

Updated 25-May-20 12:17pm

Maciej Los

v2

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Maciej Los 25-May-20 16:33pm

You're doing it wrong. You have to create another thread and display splash screen as long as main form is loading.
Do you want to display additional information on splash screen during loading progress?

Usarsef 25-May-20 16:48pm

Now i have a splash screen with timer after it finish shows main form without problems
but after i start new debug shows this msg 'error while trying to run project could not load file or assembly file used by other process'

2 solutions

Solution 2

this.Hide();
frmLogin o = new frmLogin();
o.show();
o.Closed += (s, args) => this.Close();

Posted 25-May-20 12:18pm

Usarsef

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Maciej Los · Accepted Answer · 2020-05-25T10:41:00

Solution 1

Please, read my comment to the question first.

Here is a list of links:
A Pretty Good Splash Screen in C#[^]
Transparent Splash Screen[^]
Yet Another Splash Screen in C#[^]
Use a splash screen in your application[^]
C# WinFroms Splash Screen – Dan McIntyre[^]

Posted 25-May-20 10:41am

Maciej Los