UWP - CheckBox group example

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 Margin="50" Orientation="Vertical">
        <TextBlock
            x:Name="textblock1"
            Text="Choose your favorite colors."
            />
        <CheckBox x:Name="checkbox_1" Content="Red"/>
        <CheckBox x:Name="checkbox_2" Content="Green"/>
        <CheckBox x:Name="checkbox_3" Content="Blue"/>
        <CheckBox x:Name="checkbox_4" Content="Yellow"/>
        <CheckBox x:Name="checkbox_5" Content="Magenta"/>
        <CheckBox x:Name="checkbox_6" Content="Pink"/>
        <CheckBox x:Name="checkbox_7" Content="Orange"/>
        <Button 
            x:Name="button_1" 
            Content="Show Result"
            Click="button1_click"
            />
        <TextBlock
            x:Name="textblock2"
            TextWrapping="Wrap"
            />
    </StackPanel>
</Page>

MainPage.xaml.cs

using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;


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

        private void button1_click(object sender, RoutedEventArgs e)
        {
            // Set the text block text
            textblock2.Text = "Your favorite colors are : ";

            // Initialize an empty string
            string colors = string.Empty;

            // Initiaze an array of checkboxes
            CheckBox[] checkboxes = new CheckBox[] {
                checkbox_1,
                checkbox_2,
                checkbox_3,
                checkbox_4,
                checkbox_5,
                checkbox_6,
                checkbox_7
            };

            foreach (CheckBox c in checkboxes) {
                if (c.IsChecked == true) {
                    if (colors.Length > 1) {
                        colors += ", ";
                    }
                    // Add the checked color to the selected colors list
                    colors += c.Content;
                }
            }

            // Finally, display the checked colors to text block
            textblock2.Text += colors;
        }
    }
}