avoid an application closing when calculations are in progress?

[bouli]

Hello gurus, I'd like to know how to avoid an application closing when calculations are being performed? I tried to trap the Closing event and set the e.Cancel to false, but it quits anyway :( private void frmMain_Closing(object sender, System.ComponentModel.CancelEventArgs e) { if (_permuting) e.Cancel=!_permuting; } Thanks for the help. There is no spoon.

[eggie5]

What is "closing" your app? How do you know your catching the right method? What about Application.Exit()???? /\ |_ E X E GG

[Peter Molnar]

This is a multithreading issue. 1.Spawn a worker thread with the the long calculation

Thread m_Thread;
...
m_Thread = new Thread(new ThreadStart(MyLongCalculationFunction));
m_Thread.Start();

2.In your Form_Closing handler check the thread state

if (m_Thread.ThreadState == ThreadState.Running) ...

If running, dont let the dialog close by giving

e.Cancel = true;

Peter Molnar