How I can deallocate resources when the process gets killed

Hi,

If you use Windows Forms, then you can use the Form.FormClosing[^] event:

void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
    if (e.CloseReason == CloseReason.TaskManagerClosing)
    {
        // Task Manager is closing the application
    }
    else if (e.CloseReason == CloseReason.WindowsShutDown)
    {
        // application is closed because Windows is shutting down
    }
    else if (e.CloseReason == CloseReason.UserClosing)
    {
        // user closes the form
    }
    else
    {
       // other reason
    }
}

Here you'll find all enum fields of the CloseReason enum: http://msdn.microsoft.com/en-us/library/system.windows.forms.closereason.aspx[^]
If you use WPF, use the Window.Closing[^] event.
But if Task Manager closes the application, then the function will be called only if the user clicks on the "End Task" button. Clicking on the "End Task" button is similar to the Process.Close[^] method. If the user clicks on the "End Process" button, then the process will be stopped immediately, then you can't deallocate resources. Clicking on the "End Process" button is similar to the Process.Kill method[^]

Hope this helps.