Inheritance: System.Exception
 public override void Done(ParseException e)
 {
     if (e == null)
     {
         // Show a simple Toast message upon successful registration
         ThisApp.AlertBox(_context, "SUCCESS!", "Successfully signed up. Please log in.");
     }
     else if (e.Code == ParseException.UsernameTaken)
     {
         ThisApp.AlertBox(_context, "REMINDER!", "Username taken.");
     }
     else
     {
         ThisApp.AlertBox(_context, "REMINDER!", "There was an error.\n\n" + e.Message);
     }
 }
 public override void Done(ParseUser user, ParseException e)
 {
     if (e == null)
     {
         // If user exist and authenticated
         //ThisApp.AlertBox(_context, "SUCCESS!", "Successfully logged in!");
         Toast.MakeText(_context, "Successfully logged in as " + ParseUser.CurrentUser.Username + "! You can now sync your notes!", ToastLength.Long).Show();
         _context.Finish();
     }
     else if (e.Code == ParseException.ObjectNotFound)
     {
         ThisApp.AlertBox(_context, "REMINDER!", "Incorrect username or password. Please try again.");
     }
     else
     {
         ThisApp.AlertBox(_context, "REMINDER!", "Unknown error. Check your connections.\n\n" + e.Message);
     }
 }