Encrypt & Decrypt Strings in Silverlight

namespace Encrypt_Decrypt_SBA
{
    using System.Windows.Controls;
    using System.Windows.Navigation;
    using Encrypt_Decrypt_SBA.Helpers;
    using System.Windows;

    /// <summary>
    /// Página de inicio de la aplicación.
    /// </summary>
    public partial class Home : Page
    {
        /// <summary>
        /// Crea una nueva instancia de <see cref="Home"/>.
        /// </summary>
        public Home()
        {
            InitializeComponent();

            this.Title = ApplicationStrings.HomePageTitle;
        }

        /// <summary>
        /// Se ejecuta cuando el usuario navega a esta page.
        /// </summary>
        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
        }

        private void btnEncrypt_Click(object sender, System.Windows.RoutedEventArgs e)
        {
            //Encrypt the text inside simpleText and empty the textbox to show functionality
            this.EncryptedText.Text = this.simpleText.Text.Encrypt();
            this.simpleText.Text = string.Empty;
        }

        private void btnDencrypt_Click(object sender, System.Windows.RoutedEventArgs e)
        {
            //Decrypt the string 
            MessageBox.Show(this.EncryptedText.Text.Decrypt());
            this.EncryptedText.Text = string.Empty;
        }

        private void btnEncryptService_Click(object sender, System.Windows.RoutedEventArgs e)
        {
            //Instanciate the proxy for ServiceTest
            ServiceTest.ServiceTestClient proxy = new ServiceTest.ServiceTestClient();
            //Call to the completed event of that proxy
            proxy.EncryptStringCompleted += (s, args) =>
            {
                this.simpleTextService.Text = string.Empty;
                this.EncryptedTextService.Text = args.Result;
            };
            //Call the async method and pass the parameter
            proxy.EncryptStringAsync(this.simpleTextService.Text);
        }

        private void btnDencryptService_Click(object sender, System.Windows.RoutedEventArgs e)
        {
            //Instanciate the proxy for ServiceTest
            ServiceTest.ServiceTestClient proxy = new ServiceTest.ServiceTestClient();
            //Call to the completed event of that proxy
            proxy.DecryptStringCompleted += (s, args) =>
            {
                MessageBox.Show("Via service: "+args.Result);
                this.EncryptedTextService.Text = string.Empty;
            };
            //Call the async method and pass the parameter
            proxy.DecryptStringAsync(this.EncryptedTextService.Text);
        }
    }
}