combine opencv code with c# code

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C#

OpenCV

I need to convert the opencv (c /c++) program into a dll file. I want to use that dll in c# windows form Application.
I tried some methods which is given by some sites but while adding the references in window forms applications I got an error.

This is my program

#include "stdafx.h"
#include "cv.h"


#include "highgui.h"
#include <stdio.h>


void  main(const char*filename)
{
if  (filename ==0)
    {
        printf("The image not loaded\n");
        return -1;
    }
    IplImage* input_im = 0;
    input_im = cvLoadImage(filename);
    cvNamedWindow("InputImage",CV_WINDOW_AUTOSIZE);
    cvShowImage("InputImage",input_im);
    cvWaitKey(0);
    cvDestroyWindow("InputImage");
    cvReleaseImage(&input_im);

}

When i complied this program its compile within not errors. But When i strated to debugging it shows error as follow error - Unable to start program 'c:\users\my\destop\cam\estlib.dill

I don't know where made a mistake.Please help me
Thank you