cognitive-error.cs

private CustomVisionPredictionClient _endpoint;

// ...

if (_endpoint == null)
{
    _endpoint = new CustomVisionPredictionClient
    {
        ApiKey = App.PredictionKey // PredictionKey copied from the CustomVision.ai project
    };
}

// ...

IEnumerable<PredictionModel> tags = null;

using (var stream = file.GetStream())
{
    tags = _endpoint.ClassifyImage(App.ProjectGuid, "Iteration2", stream)
        .Predictions
        .OrderByDescending(p => p.Probability);
}