title: Push Notification in Windows Phone 8.1
body: <p>I am creating an Windows Phone 8.1 Application (not Silverlight Application). I want to implement Push Notificaion in my app but while I try to add Microsoft.Phone.dll to my application to use  HttpNotificationChannel, it shows exception on build as "Cannot find type System.SystemException in module mscorlib.dll". </p>
  
  <p>Can someone help me with this?</p>
  
  <p>Thanks</p>