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 private Bitmap CreateScreenshot(int left, int top, int width, int height)
        {
            try
            {
                Bitmap delete = new Bitmap("c:\\testpng.png");
                delete.Dispose();
                GC.Collect();
                File.Delete("c:\\testpng.png");
            }
            catch
            {
            }
            Bitmap bmp = new Bitmap(width, height);
            Graphics g = Graphics.FromImage(bmp);
            g.CopyFromScreen(left, top, 0, 0, new Size(width, height));
            g.Dispose();
            bmp.Save("c:\\testpng.png");
            System.Drawing.Bitmap.FromFile("c:\\testpng.png").Save("c:\\test.tif", System.Drawing.Imaging.ImageFormat.Tiff);
            return bmp;
        }                    

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Bitmap scan = new Bitmap("eurotext.tif");
tessnet2.Tesseract ocr = new tessnet2.Tesseract();
ocr.SetVariable("tessedit_char_whitelist", "0123456789"); // If digit only
ocr.Init(@"c:\temp", "fra", false); // To use correct tessdata
List<tessnet2.Word> result = ocr.DoOCR(scan, Rectangle.Empty);
foreach (tessnet2.Word word in result)
{
    Console.WriteLine("{0} : {1}", word.Confidence, word.Text);
}