stream don't mathch with FileInfo this error appear No overload for method 'ReadJpeg' takes 2 arguments

WriteableBitmap    wb = new WriteableBitmap((int)Camera.PreviewResolution.Width,(int)Camera.PreviewResolution.Height);
                Camera.GetPreviewBufferArgb32(pixels);
                pixels.CopyTo(wb.Pixels, 0);
                var imageStream = new MemoryStream();
                Stream myStream = imageStream;
                wb.SaveJpeg(myStream , wb.PixelWidth, wb.PixelHeight, 0, 100);
//then I'm write this code to retun angle

int GetAngleFromExif(Stream myStream)
    {
      var position = myStream.Position;
      myStream.Position = 0;
      ExifOrientation orientation = <b>ExifReader.ReadJpeg(
        myStream, String.Empty).Orientation;
       myStream.Position = position;

             switch (orientation)
                    {
                        case ExifOrientation.TopRight:
                            return 90;
                        case ExifOrientation.BottomRight:
                            return 180;
                        case ExifOrientation.BottomLeft:
                            return 270;
                        case ExifOrientation.TopLeft:
                        case ExifOrientation.Undefined:
                        default:
                            return 0;
                    }
                }

//and tis is the ReadJpeg
public static JpegInfo ReadJpeg(FileInfo fi)
        {
            DateTime then = DateTime.Now;
            using (FileStream fs = fi.OpenRead())
            {
                ExifReader reader = new ExifReader(fs);
                reader.info.FileSize = (int)fi.Length;
                reader.info.FileName = fi.Name;
                reader.info.LoadTime = (DateTime.Now - then);
                return reader.info;
            }
        }