---

{
    public partial class MainWindow : Window
    {
        // initialize global name1 to create empty list
        // add items to list (добавляем красный цвет)
        private List<Brush> name1 = new List<Brush> { Brushes.Red };

        public MainWindow()
        {
            InitializeComponent();
        }

        // to procedure1 result get global name1
        private List<Brush> Procedure1()
        {
            return name1;
        }

        // when Button1.Click do
        private void Button1_Click(object sender, RoutedEventArgs e)
        {
            // set Button1.BackgroundColor to select list item (index 0)
            Button1.Background = Procedure1()[0];
        }
    }
}