Tessnet2 OCR or Many rectangles

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C#

I used the tessnet2 ocr and It is working fine , but the problem I cannot DoOCR more then one time ,
I want to split my image to many rectangles then process the ocr on each rectangle .
But I cannot call the

Bitmap bmp = new Bitmap(@"scantest.bmp");
           pictureBox1.Image = bmp;
           tessnet2.Tesseract ocr = new tessnet2.Tesseract();
           ocr.Init(null, "eng", false);
          // ocr.SetVariable("tessedit_char_whitelist", "0123456789qwertyuiopasdfghjklzxcvbnm");
           ocr.ProgressEvent += new tessnet2.Tesseract.ProgressHandler(ocr_ProgressEvent);
           ocr.OcrDone = new tessnet2.Tesseract.OcrDoneHandler(Done);
           Rectangle rec1=new Rectangle(0,200,1000,800);
        Rectangle rec2 = new Rectangle(0, 0, 1000, 200);
           ocr.DoOCR(bmp, rec1);
        //   ocr.OcrDone = new tessnet2.Tesseract.OcrDoneHandler(Done);
          ocr.DoOCR(bmp, rec2);

are there any suggestions ?