OCR not Recognised on Image

[Harsh Kansara]

Dear,

I am new to tesseract, can any1 suggest documentation for tessnet (tesseract for .net) for methods and their usage, also i am facing difficulty in processing simple captcha image which is provided in attached file, and below is the code

 if (this.m_image == null || string.IsNullOrEmpty(this.txtLang.Text))

                return;

            this.progressBar1.Value = 0;

            this.lstResult.Items.Clear();

            Tesseract tesseract = new Tesseract();

            tesseract.SetVariable("tessedit_char_whitelist", "0123456789"); // If digit only

            tesseract.Init(this.txtPath.Text, this.txtLang.Text, false);          

            tesseract.ProgressEvent += new Tesseract.ProgressHandler(this.ocr_ProgressEvent);

            tesseract.OcrDone = new Tesseract.OcrDoneHandler(this.Done);

            tesseract.DoOCR(this.m_image, Rectangle.Empty);

please reply