How to close C# winform when user will click X of form?

Hi All,
When you close winform but did not exit from system then that application is still running in background .
So how to close application properly on click of X button in form.

Solution is Simple:
make a function logout() and add exit code there like below:

private void logout_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }
and either inside InitializeComponent() function or after InitializeComponent() function add below code :
this.FormClosing += logout_Click;

and voila you can close whole application by click of Red X button on form.

Please comment if you have any question.

Thanks
Abhi