thumbnails generation problem

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C#

where as strin []bb = Directory.GetDirectories("c:\images\", "*.*", SearchOption.AllDirectories);

the problem is that it generate thumbnails but it ignore the folder strudcture, suppose
folder a->sub folder b->sub folder c,
so the result will be
folder a,
folder b,
folder c.
and it should be the same as the original folder .

<pre lang="cs">public void CreateThumbnail(string[] bb, double wid, double hght, bool Isprint)

        {

            
            string saveAt = "i:\\check\\a test\\";

            foreach (string path in bb)
            {
                var directory = new DirectoryInfo(path);

                string outputPath = Path.Combine(saveAt, directory.Name);
                foreach (FileInfo f in directory.GetFiles("*.*", SearchOption.AllDirectories))

                {
                    if (f.DirectoryName != directory.FullName)
                    {
                        outputPath = Path.Combine(saveAt, directory.Name, f.Directory.Name);

                    }
                    if (!Directory.Exists(outputPath))
                    {
                        Directory.CreateDirectory(outputPath);

                    }

                    using (Image imagesize = Image.FromFile(f.FullName))

                    using (Bitmap bitmapNew = new Bitmap(imagesize))

                    {
                        double maxWidth = wid;
                        double maxHeight = hght;
                        int w = imagesize.Width;

                        int h = imagesize.Height;
                        // Longest and shortest dimension
                        int longestDimension = (w > h) ? w : h;

                        int shortestDimension = (w < h) ? w : h;
                        // propotionality
                        float factor = ((float)longestDimension) / shortestDimension;

                        // default width is greater than height
                        double newWidth = maxWidth;
                        double newHeight = maxWidth / factor;

                        // if height greater than width recalculate
                        if (w < h)
                        {
                            newWidth = maxHeight / factor;

                            newHeight = maxHeight;
                        }

                        string fileName = Path.Combine(outputPath, Path.GetFileNameWithoutExtension(f.Name) + ".jpeg");

                        bitmapNew.GetThumbnailImage((int)newWidth, (int)newHeight, () => false, IntPtr.Zero)

                            .Save(fileName, System.Drawing.Imaging.ImageFormat.Jpeg);



                    }

                }
            }
        }