simple c# class for Optical Character Recognition(OCR) using tesseract (http://code.google.com/p/tesseract-ocr/) usage: pass .exe path to constructor

tesseract-ocr-class.cs

// usage:
//
// TesseractOCR ocr = TesseractOCR(@"C:\bin\tesseract.exe");
// string result = ocr.OCRFromBitmap(bmp);
// textBox1.Text = result;
//
using System;
using System.IO;
using System.Diagnostics;
using System.Drawing;

public class TesseractOCR
{
    private string commandpath;
    private string outpath;
    private string tmppath;

    public TesseractOCR(string commandpath)
    {
        this.commandpath = commandpath;
        tmppath = System.Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData) + @"\out.tif";
        outpath = System.Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData) + @"\out.txt";
    }
    public string analyze(string filename)
    {
        string args = filename + " " + outpath.Replace(".txt", "");
        ProcessStartInfo startinfo = new ProcessStartInfo(commandpath, args);
        startinfo.CreateNoWindow = true;
        startinfo.UseShellExecute = false;
        Process.Start(startinfo).WaitForExit();

        string ret = "";
        using (StreamReader r = new StreamReader(outpath))
        {
            string content = r.ReadToEnd();
            ret = content;
        }
        File.Delete(outpath);
        return ret;
    }
    public string OCRFromBitmap(Bitmap bmp)
    {
        bmp.Save(tmppath, System.Drawing.Imaging.ImageFormat.Tiff);
        string ret = analyze(tmppath);
        File.Delete(tmppath);
        return ret;
    }
    public string OCRFromFile(string filename)
    {
        return analyze(filename);
    }
}

Hello

It it throws an exception for not having the outpath, particularly this code does not work (I have tried different types of outpath)