static string RecognizeRegionsFromUrl(Configuration conf)
        {
            string           urlToFile = @"https://upload.wikimedia.org/wikipedia/commons/2/2f/Book_of_Abraham_FirstPage.png";
            List <OCRRegion> mImageBook_of_Abraham_FirstPagePngRegions = new List <OCRRegion>()
            {
                new OCRRegion()
                {
                    Order = 0, Rect = new OCRRect(209, 28, 283, 39)
                },
                new OCRRegion()
                {
                    Order = 1, Rect = new OCRRect(24, 114, 359, 185)
                },
                new OCRRegion()
                {
                    Order = 2, Rect = new OCRRect(21, 201, 356, 451)
                },
                new OCRRegion()
                {
                    Order = 3, Rect = new OCRRect(21, 464, 359, 558)
                }
            };

            OcrApi api = new OcrApi(conf);
            OCRRegionsRequestData requestData = new OCRRegionsRequestData()
            {
                Regions = mImageBook_of_Abraham_FirstPagePngRegions
            };
            OCRResponse response = api.OcrRegionsFromUrl(requestData, urlToFile);

            return(response.Text);
        }