private async void TalkBtn_Click(object sender, RoutedEventArgs e) { if (client.ViewModel.IsTalkPanelEnable == false) { client.ViewModel.IsTalkPanelEnable = true; await Task.Run(() => { try { client.TalkList(); } catch (Exception ex) { Console.WriteLine(ex.Message); } }); } else { client.ViewModel.IsTalkPanelEnable = false; } }