want to show image in wpf

byte[] b;
                //b=memStream.GetBuffer();
        b = System.IO.File.ReadAllBytes(openfile.FileName);
        MemoryStream byteStream = new MemoryStream(b);
        BitmapImage image = new BitmapImage();
        image.BeginInit();
        image.StreamSource = byteStream;
        image.EndInit();

        image1.Source = image;