asp.net website folder copy by coding

folder copy by coding in folder page also copy in asp.net code

  _Fname = FileUpload1.FileName.ToString();
            _Path = "../ProductImage/" + _Fname;
          // string rep = _Path.Replace("~/", "");
            string rep = "ProductImage/" + _Fname;
            //FileUpload1.SaveAs(Server.MapPath(_Path));



            string filename = Path.GetFileName(FileUpload1.PostedFile.FileName);
            string targetPath = Server.MapPath(_Path);
            Stream strm = FileUpload1.PostedFile.InputStream;
            var targetFile = targetPath;
            //Based on scalefactor image size will vary
            GenerateThumbnails(0.5, strm, targetFile);


 private void GenerateThumbnails(double scaleFactor, Stream sourcePath, string targetPath)
    {
        using (var image =System.Drawing.Image.FromStream(sourcePath))
        {
            var newWidth = (int)(image.Width * scaleFactor);
            var newHeight = (int)(image.Height * scaleFactor);
            var thumbnailImg = new Bitmap(newWidth, newHeight);
            var thumbGraph = Graphics.FromImage(thumbnailImg);
            thumbGraph.CompositingQuality = CompositingQuality.HighQuality;
            thumbGraph.SmoothingMode = SmoothingMode.HighQuality;
            thumbGraph.InterpolationMode = InterpolationMode.HighQualityBicubic;
            var imageRectangle = new Rectangle(0, 0, newWidth, newHeight);
            thumbGraph.DrawImage(image, imageRectangle);
            thumbnailImg.Save(targetPath, image.RawFormat);
        }
    }