Rotate and Flip an Image

public static Image RotateImage(Image img, float rotationAngle)
{
 //create an empty Bitmap image
 Bitmap bmp = new Bitmap(img.Width, img.Height);
 //turn the Bitmap into a Graphics object
 Graphics gfx = Graphics.FromImage(bmp);
 //now we set the rotation point to the center of our image
    gfx.TranslateTransform((float)bmp.Width / 2, (float)bmp.Height / 2);
 //now rotate the image
    gfx.RotateTransform(rotationAngle);
    gfx.TranslateTransform(-(float)bmp.Width / 2, -(float)bmp.Height / 2);
 //set the InterpolationMode to HighQualityBicubic so to ensure a high
 //quality image once it is transformed to the specified size
    gfx.InterpolationMode = InterpolationMode.HighQualityBicubic;
 //now draw our new image onto the graphics object
    gfx.DrawImage(img, new Point(0, 0));
 //dispose of our Graphics object
    gfx.Dispose();
 //return the image
 return bmp;
}