close all open forms before closing the current one

mind controll

I have total 4 forms .. when a button on form2 is clicked it loads form3 and minimize form2 and on close of form3 it refocus form2 and same with form4 it loads from a button on form3 and form3 is minimized

so if I returned to form2 and clicked the x button it gives an error because form3 wants to refocus form2 that is already closing
please help

4 Replies

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Vulpes12y ago
Accepted answer
It sounds like you may have other foreground threads still running which will prevent the process from ending.

You can kill the process by calling Environment.Exit(1) rather than Application.Exit().

However, this kills it stone dead and so if you're relying on FormClosing or FormClosed eventhandlers running, then I'd place it just after Application.Run in the Main() method and call Application.Exit where you're calling it now.
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mind controll12y ago
thank man u are the best
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mind controll12y ago
closing form1 method worked for me but the application process is still running that's why I was using this ..
Application.Exit();

Process[] localByName = Process.GetProcessesByName("myapp");

foreach (Process p in localByName)

{

p.Kill();

}

how can I do both .. closing main form and also kill the app process ?
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Vulpes12y ago
As far as Form3 is concerned, it sounds to me like the best thing to do is to check that Form2 is still open before attempting to refocus it.

You could use the following code to do that (assuming there are no mdi children here):

bool stillOpen = false;

foreach(Form f in Application.OpenForms)
{
if (f.Name == "Form2")
{
stillOpen = true;
break;
}
}

if (stillOpen)
{
// existing code to refocus Form2
}

If you have a similar situation with Form4, then the same code can be used with "Form3" replacing "Form2".

If you want to close all open forms, then your best option is to close the start-up form, Form1, as this will automatically close the others:

Form1 f1 = Application.OpenForms["Form1"] as Form1;
f1.Close();

You could also call Application.Exit() which (more or less) does the same thing.

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