private async void GetAllTasks(TaskViewModel viewModel)
{
ApplicationDataContainer local = ApplicationData.Current.LocalSettings;
int tripID = Int32.Parse(local.Values["tripID"].ToString());
await viewModel.GetAllTasks(tripID);
tasks = viewModel.Tasks;
TaskList.ItemsSource = tasks;
if (tasks.Count == 0 || tasks == null)
{
ProgressBar.Visibility = Visibility.Collapsed;
}
ProgressbarPercentageToDo();
}