Cancel Application Exit

Question

My application is closing when I press Alt + F4. How I will do to have a MessageBox to show first for confirmation before exiting and if No is response the applcation will not continue to close?

Answer 1

In addition to the answers already posted here, don't be the dork that hangs the complete system:

    private void Form1_FormClosing(object sender, FormClosingEventArgs e)
    {
        if (e.CloseReason != CloseReason.UserClosing)
        {
           e.Cancel = false;
           return;
        }

        // other logic with Messagebox
        ...
    }