Async gotcha in C# II

MainPage.cs

async void AcquireFromCamera(object sender, RoutedEventArgs e)
{
    try
    {
        var imageStream = await _cameraCapture.Shoot();
        var dto = new Dto(){ImageStream = imageStream};
        _handler.ImageCaptured(dto);
        Frame.Navigate(typeof(EditDataPage), dto.Id);
    }
    catch (Exception ex)
    {
        new MessageDialog(ex.Message).ShowAsync();
    }
}