UWP - ComboBox alternate item color

MainPage.xaml

<Page
    x:Class="UniversalAppTutorials.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:UniversalAppTutorials"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">
    <StackPanel 
        x:Name="stack_panel1" 
        Margin="50" 
        Orientation="Horizontal"
        Background="LightPink"
        Padding="50"
        >
        <ComboBox 
            x:Name="ComboBox1"
            SelectionChanged="ComboBox1_SelectionChanged"
            Margin="0,175,0,0"
            />
        <TextBlock
            x:Name="TextBlock1"
            Foreground="Crimson"
            FontFamily="Calibri"
            FontSize="25"
            Text="Select a color from ComboBox."
            TextWrapping="WrapWholeWords"
            Margin="150,175,0,0"
            />
    </StackPanel>
</Page>

MainPage.xaml.cs

using Windows.UI.Xaml.Controls;
using Windows.UI;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml;
using Windows.UI.Text;


namespace UniversalAppTutorials
{
    public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            this.InitializeComponent();

            // Initialize a new string array
            string[] colors = {
                "Red",
                "Green",
                "Blue",
                "Yellow",
                "Snow",
                "Gold",
                "Forest Green",
                "Medium Sea Green"
            };

            // Get the ComboBox item collection
            ItemCollection ic = ComboBox1.Items;

            // Loop through the array elements
            for (int index = 0; index < colors.Length; index++) {
                // Initialize a new ComboBoxItem instance
                ComboBoxItem item = new ComboBoxItem();

                // Set item padding
                item.Padding = new Thickness(10,5,10,5);

                // Set item font size
                item.FontSize = 20;

                // Set the item content
                item.Content = colors[index];

                // Set item font
                item.FontFamily = new FontFamily("MV Boli");
                item.FontWeight = FontWeights.Bold;
                item.Foreground = new SolidColorBrush(Colors.Black);

                if (index % 2 == 0)
                {
                    // Set rugular item style
                    item.Background = new SolidColorBrush(Colors.SeaGreen);
                }
                else {
                    // Set alternate item style
                    item.Background = new SolidColorBrush(Colors.MediumSeaGreen);
                }

                // Add the item to item collection
                ic.Add(item);
            }
        }

        private void ComboBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            // Get the instance of ComboBox
            ComboBox comboBox = sender as ComboBox;

            // Get the ComboBox selected item
            ComboBoxItem item = (ComboBoxItem)comboBox.SelectedItem;

            // Get the ComboBox selected item text
            string selectedItemText = item.Content.ToString();

            // Finally, display the ComboBox selected item text to text block
            TextBlock1.Text = "Selected : " + selectedItemText;
        }
    }
}