encode-and-decode-emojis.cs

public sealed partial class MainPage : Page
{
    public MainPage()
    {
        this.InitializeComponent();
        this.Loaded += MainPage_Loaded;
    }

    private void MainPage_Loaded(object sender, RoutedEventArgs e)
    {
        var encodedText = "All the 🌎's a 🎦," +
            " And all the 👨 and 👩 merely 🎮; " +
            "They have their exits and their 🚪, And one 👨 " +
            "in his ⌛ 🎮 many parts...";

        MyTextBlock.Text = encodedText.DecodeHtmlEntity();
    }
}

public static class Extensions
{
    public static string EncodeHtmlEntity(this string value)
    {
        return WebUtility.HtmlEncode(value);
    }

    public static string DecodeHtmlEntity(this string value)
    {
        return WebUtility.HtmlDecode(value);
    }
}