Trying to play sound effects using XNA - windows-phone-7

Question

I'm writing my first app for windows phone, which will be a sound board, using XNa's soundeffect object.
The project is a Windows phone Silverlight and Xna Application c#
I got some sample code from the book, 101 phone 7 apps.
The linbe to load in the sound gives me a
"the type StreamResourceInfo namespace could not be found"
StreamResourceInfo info = Application.GetResourceStream(new Uri("Audio/cowbell.wav", UriKind.Relative));
the code
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 Microsoft.Xna.Framework.Audio;
namespace SlXnaApp4
{
public partial class MainPage : PhoneApplicationPage
{
SoundEffect cowbell;
// Constructor
public MainPage()
{
// Load sound file
StreamResourceInfo info = Application.GetResourceStream(new Uri("Audio/cowbell.wav", UriKind.Relative));
// create xna sound
cowbell = SoundEffect.FromStream(info);
// Sub to per frame call back
CompositionTarget.Rendering += CompositionTarget_Rendering;
// requred for xna sound effects to work
Microsoft.Xna.Framework.FrameworkDispatcher.Update();
// testb sound
cowbell.Play();
InitializeComponent();
}
void CompositionTarget_Rendering(object sender, EventArgs e)
{
Microsoft.Xna.Framework.FrameworkDispatcher.Update();
}
// Simple button Click event handler to take us to the second page
private void Button_Click(object sender, RoutedEventArgs e)
{
NavigationService.Navigate(new Uri("/GamePage.xaml", UriKind.Relative));
}
private void button1_Click(object sender, RoutedEventArgs e)
{
}
}
}

Answer 1

Add a using directive for System.Windows.Resources:
using System.Windows.Resources;