BikeInCity.App.Application_Launching C# (CSharp) Метод

        private void Application_Launching(object sender, LaunchingEventArgs e)
        {
            //WP7Timer.Start();
              //WP7Timer.Time("Start");

              //provide invariant culture fo deserialization
              Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;

              //try to get the situation which was previously saved
              City city = new City();
              try
              {
            using (IsolatedStorageFile isf = IsolatedStorageFile.GetUserStoreForApplication())
            {
              if (isf.FileExists("City.dat"))
              {
            XmlSerializer ser = new XmlSerializer(typeof(City));
            object obj = ser.Deserialize(isf.OpenFile("City.dat", System.IO.FileMode.Open)) as City;
            if (obj != null && obj is City)
            {
                city = obj as City;
                PhoneApplicationService.Current.State.Add("City", city);
            }
              }
            }
              }
              catch (Exception)
              {
            //TODO - what to do with exception in the Launching event??
              }
        }