Making WCF Service reference configurable from web.config in Silverlight application

/*-------------------------------Developed by Manoj Kumar-------------------------------*/
namespace BusinessAppMVVM
{
    using System.Windows.Controls;
    using System.Windows.Navigation;
    using System.ServiceModel;
    using System;
    using System.Windows;
    using BusinessAppMVVM.BusinessAppServiceModel;

    /// <summary>
    /// Home page for the application.
    /// </summary>
    public partial class Home : Page
    {
        
        /// <summary>
        /// Creates a new <see cref="Home"/> instance.
        /// </summary>
        public Home()
        {
            InitializeComponent();

            this.Title = ApplicationStrings.HomePageTitle;


            
        }

        /// <summary>
        /// Executes when the user navigates to this page.
        /// </summary>
        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
        }

        private void button1_Click(object sender, System.Windows.RoutedEventArgs e)
        {
            //Create Instance.
            BusinessAppServiceModel.Service1Client _serviceClient = null;
            if (_serviceClient == null)
            {
                var myBinding = new BasicHttpBinding();

                string url = ((App)Application.Current).WCFServiceURL;
                if (url != null)
                {
                    var address = new EndpointAddress(url);
                    _serviceClient = new BusinessAppServiceModel.Service1Client(myBinding, address);
                }
                else
                {
                    MessageBox.Show("WCF Service URL is not found.");
                }
            }

            //Call Service
            _serviceClient.GetUserAddressCompleted -=
                    new EventHandler<GetUserAddressCompletedEventArgs>(OnGetUserAddressCompleted);
            _serviceClient.GetUserAddressCompleted +=
                    new EventHandler<GetUserAddressCompletedEventArgs>(OnGetUserAddressCompleted);
            _serviceClient.GetUserAddressAsync("Called from UI");
           
        }
        private void OnGetUserAddressCompleted(object sender, GetUserAddressCompletedEventArgs e)
        {
            MessageBox.Show(e.Result);
        }
        
    }
}