C# Winform: How to capture win application closing from task manager

Question

I have winform application or console application. now i want to capture if user close application clicking on cross button or close application from task manager.

before closing i want to send a mail and after mail sent application will be close. how could i capture winform or console application terminating from task bar?

please guide me how to do it by a sample code.

Thanks

Answer 1

Hi TZacks-2728,
The task manager calls the Windows API ExitProcess to kill the process.
For WinForms applications, you can try Application.ApplicationExit event which occurs when the application is about to shut down.
You must attach an event handler to the ApplicationExit event to send mail before the application stops running.

 // Handle the ApplicationExit event to know when the application is exiting.  
    Application.ApplicationExit += new EventHandler(this.OnApplicationExit);  

For more details, you can refer to the example in the document.
And the code example using the forked process in the link provided by periczeljkosmederevo is also a good suggestion.
Best Regards,
Daniel Zhang

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Answer 2

Hello,
there are event handlers, FormClosing and FormClosed, that are raised when Main form is closing or is closed. Trough FormClosingEventArgs e variable and its property e.ClosingReason You can find out why app is closing. Both events are raised when user click at close button on window form, the X button, or at task bar selects option end task, or close button.

void Main_Form_Closing(object sender, FormClosingEventArgs e)
{
       MessageBox.Show(e.CloseReason.ToString());
}

Here is good article about that subject:

https://www.codeproject.com/articles/20533/how-to-know-when-the-task-manager-kills-your-app

All the best,
Željko Perić