...
using Microsoft.ProjectOxford.Vision;
using System.Threading.Tasks;
...

namespace VisionRacing.AnalyzeKartingImage
{
    class Program
    {
        ...
        private static async Task AnalyzeImage(string apiKey, string apiUrl, string imageUrl)
        {
            var vsc = new VisionServiceClient(apiKey, apiUrl);

            var visualFeatures = new VisualFeature[]
            {
                VisualFeature.Description, VisualFeature.Tags
            };

            var analysisResult = await vsc.AnalyzeImageAsync(imageUrl, visualFeatures);

            ShowAnalysisResult(analysisResult);
        }
        ...
    }
}