static async Task Main(string[] args)
        {
            await GetAreaOfInterestSample.RunAsync(endpoint, subscriptionKey);

            Console.WriteLine("\nPress ENTER to exit.");
            Console.ReadLine();
        }
        public const string endpoint        = "https://westus.api.cognitive.microsoft.com"; // You must use the same Azure region that you generated your subscription keys for.  Free trial subscription keys are generated in the westus region.

        static void Main(string[] args)
        {
            GetAreaOfInterestSample.RunAsync(endpoint, subscriptionKey).Wait(5000);

            Console.WriteLine("\nPress ENTER to exit.");
            Console.ReadLine();
        }