using System.Collections.Generic;
using System.Windows;

namespace ComboBoxBinding
{
    public partial class MainWindow : Window
    {
        private List<ComboItem> _myComboItems = new List<ComboItem>()
        {
            new ComboItem("Red", "Green"),
            new ComboItem("Orange", "Blue"),
            new ComboItem("Yellow", "Purple"),
            new ComboItem("Green", "Red"),
            new ComboItem("Blue", "Orange"),
            new ComboItem("Purple", "Yellow")
        };

        public List<ComboItem> MyComboItems
        {
            get { return _myComboItems; }
        }

        public ComboItem SelectedComboItem
        { get; set; }

        private void button_Click(object sender, RoutedEventArgs e)
        {
            MessageBox.Show(GetOppositeColor(SelectedComboItem));
        }

        private string GetOppositeColor(ComboItem item)
        {
            if (item != null)
                return item.OppositeColor;

            return "No opposite color available";
        }

        public MainWindow()
        {
            InitializeComponent();
        }
    }



    public class ComboItem
    {
        public string Color { get; private set; }
        public string OppositeColor { get; private set; }

        public ComboItem(string color, string opposite)
        {
            Color = color;
            OppositeColor = opposite;
        }
    }

}