can't creat multiple trackbars in opencv2.4.9 with visual studio 2012

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Hello! i'm biggner in programming. I've copied this code in visual studio 2012,

#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/highgui/highgui.hpp"
#include <iostream>
using namespace std;
using namespace cv;
Mat src;
void MyCallbackForBrightness(int iValueForBrightness, void *userData)
{
    Mat dst;
    int iValueForContrast = *( static_cast<int*>(userData) );
    //Calculating brightness and contrast value
    int iBrightness = iValueForBrightness - 50;
    double dContrast = iValueForContrast / 50.0;
    //Calculated contrast and brightness value
    cout << "MyCallbackForBrightness : Contrast=" << dContrast << ", Brightness=" << iBrightness << endl;
    //adjust the brightness and contrast
    src.convertTo(dst, -1, dContrast, iBrightness);
    //show the brightness and contrast adjusted image
    imshow("My Window", dst);
}

void MyCallbackForContrast(int iValueForContrast, void *userData)
{
    Mat dst;
    int iValueForBrightness = *( static_cast<int*>(userData) );
    //Calculating brightness and contrast value
    int iBrightness = iValueForBrightness - 50;
    double dContrast = iValueForContrast / 50.0;
    //Calculated contrast and brightness value
    cout << "MyCallbackForContrast : Contrast=" << dContrast << ", Brightness=" << iBrightness << endl;
    //adjust the brightness and contrast
    src.convertTo(dst, -1, dContrast, iBrightness);
    //show the brightness and contrast adjusted image
    imshow("My Window", dst);
}

int main(int argc, char** argv)
{
    // Read original image
    IplImage *dd = cvLoadImage("D:\\ashish.png");
    Mat src(dd);
    //if fail to read the image
    if (src.data == false)
    {
        cout << "Error loading the image" << endl;
        return -1;
    }
    // Create a window
    namedWindow("My Window", 1);
    int iValueForBrightness = 50;
    int iValueForContrast = 50;
    //Create track bar to change brightness
    createTrackbar("Brightness", "My Window", &iValueForBrightness, 100, MyCallbackForBrightness, &iValueForContrast);
    //Create track bar to change contrast
    createTrackbar("Contrast", "My Window", &iValueForContrast, 100, MyCallbackForContrast, &iValueForBrightness);
    imshow("My Window", src);
   // Wait until user press some key
    waitKey(0);
    return 0;
}

in output image is displayed on the window only with "one"(not two as in code) trackbar but as i changed the position of slider on that it give following error

Unhandled exception at at 0x75CCB727 in mynewopen.exe: Microsoft C++ exception: cv::Exception at memory location 0x0036F4CC.

---and also the name of the trackbar that is in code is not same as in displayed output it shows some random symbols.