public MessageVM() { db = new Database(Database.connectStr); List_ConfirmMessages = new ObservableCollection <ConfirmMessageModel>(); List_Messages = new ObservableCollection <MessageModel>(); if ((App.Current as App).UserId == 0) { getUserInfo(); } else { client.GetMessgeAsync((App.Current as App).UserId); client.GetMessgeCompleted += new EventHandler <GetMessgeCompletedEventArgs>(client_GetMessgeCompleted); } }