Enable/Disable Form Close

This disables the system menu file close

        private const int SC_CLOSE = 0xF060;
        private const int MF_ENABLED = 0x0;
        private const int MF_DISABLED = 0x1;

        [DllImport("user32.dll")]
        private static extern IntPtr GetSystemMenu(IntPtr hWnd, bool bRevert);

        [DllImport("user32.dll")]
        private static extern int EnableMenuItem(IntPtr hMenu, int wIDEnableItem, int wEnable);

        private void DisableFormClose()
        {
            EnableMenuItem(GetSystemMenu(this.Handle, false), SC_CLOSE, MF_DISABLED);
        }

        private void EnableFormClose()
        {
            EnableMenuItem(GetSystemMenu(this.Handle, false), SC_CLOSE, MF_ENABLED);
        }

Need to add something that disables the File Close menu