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Rotate a image.

Here I will explain how to rotate a image. 

 public void FlipImage(string Filename, string NewFileName)
 {
      System.Drawing.Image img = System.Drawing.Image.FromFile(System.Web.Hosting.HostingEnvironment.MapPath("/images/") + Filename);
      //Rotate the image in memory
      img.RotateFlip(System.Drawing.RotateFlipType.Rotate270FlipNone);
      System.IO.File.Delete(System.Web.Hosting.HostingEnvironment.MapPath("/images/" + NewFileName));
      //save the image out to the file
      img.Save(System.Web.Hosting.HostingEnvironment.MapPath("/images/" + NewFileName));
      //release image file
      img.Dispose();
 }
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