WP应用增加邮件反馈和评分

private void FeedBackBtn_Click(object sender, RoutedEventArgs e)
{
        try
        {
            EmailComposeTask task = new EmailComposeTask();
            task.To = "zhao.qinlong@gmail.com";
            task.Subject = "口袋秘书软件意见反馈";
            task.Body = "";
            task.Show();
        }
        catch (Exception)
        {
        }    
}

private void button1_Click(object sender, RoutedEventArgs e)
{
    try
        {
            new MarketplaceReviewTask().Show();
        }
    catch (Exception)
    {
    }

}