public static int?ExtractYear(Microsoft.ProjectOxford.Vision.Contract.OcrResults textAnalysisResults)
        {
            System.Collections.Generic.List <string> words = new System.Collections.Generic.List <string>();

            foreach (Microsoft.ProjectOxford.Vision.Contract.Region region in textAnalysisResults.Regions)
            {
                foreach (Microsoft.ProjectOxford.Vision.Contract.Line line in region.Lines)
                {
                    foreach (Microsoft.ProjectOxford.Vision.Contract.Word word in line.Words)
                    {
                        words.Append(word.Text);
                    }
                }
            }

            return(ExtractYear(words));
        }