Google TTS by WPF C#

1. OS: Windows 8.1
2. Tool: Visual Studio 2012
3. Coding
WPF :
<Window x:Class="WPFGoogleTTS.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525" >
    <StackPanel>
        <TextBox Name="tb1" Height="30" Width="300" >這是一個測試</TextBox>
        <Button Name="btn1" Click="btn1_Click" Width="150" Height="50" ></Button>
        <MediaElement Name="med1" Width="20" Height="20" LoadedBehavior="Manual" >
           
        </MediaElement>
    </StackPanel>
</Window>
C# :
namespace WPFGoogleTTS
{
    /// <summary>
    /// MainWindow.xaml 的互動邏輯
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void btn1_Click(object sender, RoutedEventArgs e)
        {
            var chinese = "這是一個測試。";
            string pathx = "http://translate.google.com/translate_tts?ie=UTF-8&tl=zh-TW&q=" + tb1.Text ;
            Uri u = new Uri(pathx, UriKind.RelativeOrAbsolute);
            med1.Source = u;
            med1.Play();
        }
    }
}