Closing initial Login Form from Program.cs

Morning Experts,

I'm having a bit of a brain fart. I think there is something small that I'm missing yet need help.

So.. pretty simple scenario:
Windows form app, Login window, which should be closed once user is authorized and the actual MDI application is presented.

 I modified the Program.cs file for the Login form to be displayed before the main application comes up ( code below ).
The authentication works but the Login form doesn't go away unless I close it separately. The only way it works right now If I authenticate and then close the form by hitting the Cancel button.

Any suggestions ?
Thank you in advance.

static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
 
            Login userLogin = new Login();
 
            while (!userLogin.UserIsAuthenticated && userLogin.LoginAttempts<3)
            {
                if (userLogin.ShowDialog() == DialogResult.Cancel)
                {
                    break;
                }
            }
 
            if (userLogin.UserIsAuthenticated)
            {
                Application.Run(new Main());
            }
 
            
        }
    }

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