Problem while converting from Mat to Bitmap

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  I followed this post for converting mat to bitmap.Using opencv 3.1 with visual studio 2013

  Bitmap^ thresh_callback(int thresh)
  {
  	cv::Mat canny_output;
  	vector<vector<cv::Point> > contours;
  	vector<cv::Vec4i> hierarchy;
  
  	/// Detect edges using canny
  	cv::Canny(src_gray, canny_output, thresh, thresh * 2, 3);
  	/// Find contours
  	cv::findContours(canny_output, contours, hierarchy, CV_RETR_TREE, CV_CHAIN_APPROX_SIMPLE, cv::Point(0, 0));
  
  	/// Draw contours
  	//cv::Mat drawing = cv::Mat::zeros(canny_output.size(), CV_8UC3);
  	cv::Mat drawing = src.clone();
  	for (int i = 0; i< contours.size(); i++)
  	{
  		cv::Scalar color = cv::Scalar(rng.uniform(0, 255), rng.uniform(0, 255), rng.uniform(0, 255));
  		drawContours(drawing, contours, i, color, 2, 8, hierarchy, 0, cv::Point());
  	}
  	System::IntPtr ptr2(drawing.ptr());
  	System::Drawing::Bitmap^ b2 = gcnew System::Drawing::Bitmap(drawing.cols,drawing.rows, drawing.step, System::Drawing::Imaging::PixelFormat::Format24bppRgb, ptr2);
  	/// Show in a window
  	//cv::namedWindow("Contours", CV_WINDOW_AUTOSIZE);
  	//cv::imshow("Contours", drawing);
  	return b2;
  }
  

  
  

  In 

  System::Drawing::Bitmap^ b2 = gcnew System::Drawing::Bitmap(drawing.cols,drawing.rows, drawing.step, System::Drawing::Imaging::PixelFormat::Format24bppRgb, ptr2);
  	/// Show in a window

  its giving error:

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