MessageBox when closing form

Question

Upon closing the form by clicking on the button I created named 'Exit' I want it to display a messagebox asking the user "Are you sure you want to exit?" I don't know the syntax for it, can someone help me please? Thanks

Answer 1

if (MessageBox.Show("Are you sure?", "Exit Application?", 
    MessageBoxButtons.YesNo) == DialogResult.No)
{
    // ignore it
}
else
{
    // shutdown code goes here
}

There's an MSDN example here.