Consumir un servicio web desde una aplicación WP7

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;
using System.ServiceModel;
using WindowsPhoneApplication6.ServiceReference1;

namespace WindowsPhoneApplication6
{
    public partial class MainPage : PhoneApplicationPage
    {
        // Constructor
        public MainPage()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            ServiceReference1.Service1SoapClient sw = new Service1SoapClient();
           //Manejador del evento que se desencadena cuando finaliza la ejecución del método del servicio            
           sw.HolaMundoCompleted += new EventHandler<HolaMundoCompletedEventArgs>(sw_HolaMundoCompleted);
        //invocamos el método            sw.HolaMundoAsync();
        }

        void sw_HolaMundoCompleted(object sender, HolaMundoCompletedEventArgs e)
        {
          txt_Resultado.Text=  e.Result;
        }
    }
}


video: http://vimeo.com/10987414