Unable to read image by using imshow - c++

Question

I am new to OpenCV I was trying to read image in visual studio 2012 but was not able to load image using imshow but it works fine when I use cvLoadImage.
When I execute the following code it works fine but
#include <stdio.h>
#include <iostream>
#include "opencv2/core/core.hpp"
#include "opencv2/features2d/features2d.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/calib3d/calib3d.hpp"
using namespace std;
using namespace cv;
//char key;
int main()
{
IplImage *image = cvLoadImage("test1.jpg", CV_LOAD_IMAGE_GRAYSCALE);
cvNamedWindow("hah", WINDOW_AUTOSIZE);
cvShowImage("hah", image);
waitKey(5000);
return 1;
}`
but when I write the following code it throws an exception and image does not renders
#include <stdio.h>
#include <iostream>
#include "opencv2/core/core.hpp"
#include "opencv2/features2d/features2d.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/calib3d/calib3d.hpp"
using namespace std;
using namespace cv;
//char key;
int main()
{
Mat image = imread("test1.jpg");
namedWindow("My");
imshow("My", image);
waitKey(50000);
return 1;
}
I am not able to understand what is the problem.