title: How to append a message to the end of SMSComposeTask or EmailComposeTask?
body: <p>I would like to append a small message stating how the message to a user was sent when one chooses to use the SMSComposeTask or EmailComposeTask in my application. I would like it to say something like <code>"sent from" + my application name</code> but I am not sure how to navigate to the end of the user's message and then add my text. So far I've just navigated down a couple of lines and added it manually, but I would like to go to the next line and state the message to save the user from possibly sending multiple text messages once the 160 character limit is reached.</p>
  
  <p>MainPage.xaml.cs</p>
  
  <pre><code>private void Messaging_Click(object sender, RoutedEventArgs e) {
    SmsComposeTask smsComposeTask = new SmsComposeTask();
    smsComposeTask.To = "";
    smsComposeTask.Body = "Check out this application!" + "\n\n" + "sent from " + "QuickStarts";
    smsComposeTask.Show();
  }
  private void Email_Click(object sender, RoutedEventArgs e) {
    EmailComposeTask emailComposeTask = new EmailComposeTask();
    emailComposeTask.Subject = "Share from " + "QuickStarts";
    emailComposeTask.Body = "Check out this application!" + "\n\n" + "sent from " + "QuickStarts";
    emailComposeTask.To = "";
    emailComposeTask.Cc = "";
    emailComposeTask.Bcc = "";
    emailComposeTask.Show();
  }
  </code></pre>