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using Newtonsoft.Json.Linq;

public class ComputerVisionOcrConnector : IOcrConnector
{
    private const string OcrUri = "vision/v2.1/ocr";
    private readonly string SubscriptionKey;
    private readonly string Endpoint;

    public ComputerVisionOcrConnector()
    {
        Endpoint = Environment.GetEnvironmentVariable("COMPUTER_VISION_ENDPOINT");
        SubscriptionKey = Environment.GetEnvironmentVariable("COMPUTER_VISION_SUBSCRIPTION_KEY");
    }

    public string GetServiceUri(bool detectOrientation, string language)
    {
        // Request parameters. 
        // The language parameter doesn't specify a language, so the 
        // method detects it automatically.
        // The detectOrientation parameter is set to true, so the method detects and
        // and corrects text orientation before detecting text.

        // Assemble the URI for the REST API method.
        return string.Format("{0}{1}?language={2}&detectOrientation={3}", Endpoint, OcrUri,
            string.IsNullOrEmpty(language) ? "unk" : language, detectOrientation).ToLower();
    }

    public RecognizedImage Recognize(Stream imageStream)
    {
        try
        {
            using (WebClient client = new WebClient())
            {
                client.Headers[HttpRequestHeader.Accept] = "application/json";
                // authentication
                client.Headers.Add("Ocp-Apim-Subscription-Key", SubscriptionKey);
                // payload
                BinaryReader binaryReader = new BinaryReader(imageStream);
                var data = binaryReader.ReadBytes((int)imageStream.Length);
                client.Headers[HttpRequestHeader.ContentType] = "application/octet-stream";
                string stringResponse = string.Empty;
                try
                {
                    byte[] result = client.UploadData(GetServiceUri(true, null), data);
                    stringResponse = Encoding.UTF8.GetString(result);
                }
                catch (Exception ex)
                {
                    // MS Azure Cognintive services reports 400 Bad requests and other exceptions on small pictures and pictures with no text
                    Console.WriteLine("Microsoft Azure Cognitive Services consider this image as wrong ({0})", ex.ToString());
                }
                if (!string.IsNullOrEmpty(stringResponse))
                {
                    return CreateDtoFromResponse(JToken.Parse(stringResponse));
                }
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine("Microsoft Azure Cognitive Services Text Recognition failed: {0}", ex.ToString());
        }
        return new RecognizedImage(new List<TextLine>());
    }

    protected virtual RecognizedImage CreateDtoFromResponse(JToken jToken)
    {
        // Parse json response to extract lines and words with the bounding rectangles.
    }

    ...
}