How to know user has clicked “X” or the “Close” button?

Question

In MSDN I found CloseReason.UserClosing to know that the user had decided to close the form but I guess it is the same for both clicking the X button or clickin

Answer 1

It determines when to close the application if a form is closed (if your application is not attached to a specific form).

    private void MyForm_FormClosed(object sender, FormClosedEventArgs e)
    {
        if (Application.OpenForms.Count == 0) Application.Exit();
    }