c# 旋转图片 无GDI+一般性错误

 using (System.Drawing.Bitmap backgroudImg = System.Drawing.Bitmap.FromFile(DoubleClickPicInfo.FileName) as System.Drawing.Bitmap)
                {
                    backgroudImg.RotateFlip("1".Equals(pargs) ? RotateFlipType.Rotate270FlipNone : RotateFlipType.Rotate90FlipNone);
                    System.Drawing.Bitmap backgroudImgtemp = backgroudImg;
                    backgroudImg.Save(DoubleClickPicInfo.FileName);
                    backgroudImg.Dispose();
                }