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string indexFolder = @"c:\MyIndex";
string documentFolder = @"c:\MyDocuments";

// Creating an index
Index index = new Index(indexFolder);

// Setting the OCR indexing options
IndexingOptions options = new IndexingOptions();
options.OcrIndexingOptions.EnabledForSeparateImages = true;
options.OcrIndexingOptions.EnabledForEmbeddedImages = true;
options.OcrIndexingOptions.OcrConnector = new AsposeOcrConnector();

// Indexing documents in a document folder
index.Add(documentFolder, options);

// Searching in the index
SearchResult result = index.Search("Einstein");

...

// Implementing the OCR connector that uses Aspose.OCR library
// You need to install the following package:
// https://www.nuget.org/packages/Aspose.OCR/
public class AsposeOcrConnector : IOcrConnector
{
    public AsposeOcrConnector()
    {
    }

    public string Recognize(OcrContext context)
    {
        string extension = context.ImageFileExtension.ToLowerInvariant();
        if (context.ImageLocation == ImageLocation.Separate)
        {
            switch (extension)
            {
                case ".gif":
                case ".png":
                case ".jpg":
                case ".jpeg":
                case ".bmp":
                case ".tif":
                case ".tiff":
                case "":
                    return RecognizePrivate(context);

                default:
                    return null;
            }
        }
        else if (context.ImageLocation == ImageLocation.Embedded ||
            context.ImageLocation == ImageLocation.ContainerItem)
        {
            return RecognizePrivate(context);
        }
        else
        {
            throw new NotSupportedException("The image type is not supported: " + context.ImageLocation);
        }
    }

    private string RecognizePrivate(OcrContext context)
    {
        MemoryStream memoryStream = new MemoryStream((int)context.ImageStream.Length);
        context.ImageStream.CopyTo(memoryStream);

        AsposeOcr asposeOcr = new AsposeOcr();
        string result = asposeOcr.RecognizeImage(memoryStream);
        return result;
    }
}

// Implementing the OCR connector that uses Aspose Cloud OCR
// The full API for Aspose Cloud OCR for .NET you can find in the repository:
// https://github.com/aspose-ocr-cloud/aspose-ocr-cloud-dotnet
// Sid and key you can get after free registration at
// https://dashboard.aspose.cloud/applications
public class AsposeCloudOcrConnector : IOcrConnector
{
    private readonly Configuration _configuration;

    public AsposeCloudOcrConnector()
    {
        _configuration = new Configuration();
        _configuration.AppSid = "...";
        _configuration.AppKey = "...";
    }

    public string Recognize(OcrContext context)
    {
        OcrApi api = new OcrApi(_configuration);
        var request = new PostOcrFromUrlOrContentRequest(context.ImageStream);
        OCRResponse response = api.PostOcrFromUrlOrContent(request);
        return response.Text;
    }
}

// Implementing the OCR connector that uses Tesseract
// You need to install the following packages:
// https://www.nuget.org/packages/Tesseract/
// https://www.nuget.org/packages/Tesseract.Data.English/
public class TesseractOcrConnector : IOcrConnector
{
    public TesseractOcrConnector()
    {
    }

    public string Recognize(OcrContext context)
    {
        var buffer = new byte[context.ImageStream.Length];
        context.ImageStream.Read(buffer, 0, buffer.Length);

        var path = Path.GetDirectoryName(Assembly.GetExecutingAssembly().CodeBase);
        path = Path.Combine(path, "tessdata");
        path = path.Replace("file:\\", "");

        using (var engine = new TesseractEngine(path, "eng", EngineMode.Default))
        using (Pix img = Pix.LoadFromMemory(buffer))
        using (Page recognizedPage = engine.Process(img))
        {
            string recognizedText = recognizedPage.GetText();
            return recognizedText;
        }
    }
}