การใส่ลายน้ำให้รูปพร้อมๆกันเยอะๆ

 private void button1_Click(object sender, EventArgs e)
        {
            ProcessDirectory("D:\\JAVA_งานน้องตี้\\HTMLPad\\img");
        }


        public   void ProcessDirectory(string targetDirectory)
        {
            // Process the list of files found in the directory. 
            string[] fileEntries = Directory.GetFiles(targetDirectory);
            foreach (string fileName in fileEntries)
                ProcessFile(fileName);

            // Recurse into subdirectories of this directory. 
            string[] subdirectoryEntries = Directory.GetDirectories(targetDirectory);
            foreach (string subdirectory in subdirectoryEntries)
                ProcessDirectory(subdirectory);
        }

public static void ProcessFile(string path)
        {
            Console.WriteLine("Processed file '{0}'.", path);
            Bitmap bmp = (Bitmap)(Bitmap.FromFile(path));
            Graphics gg = Graphics.FromImage(bmp);

            gg.TranslateTransform(20, 20);
            gg.RotateTransform((float)( 180.0 / Math.PI * Math.Atan2(bmp.Height , bmp.Width )  ));

            SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(128, 0, 0, 255));
            gg.CompositingQuality = CompositingQuality.GammaCorrected;
            gg.DrawString("expert-programming-tutor.com Tel. 0853507540", new Font("Ariel", 25, FontStyle.Regular), semiTransBrush, 0, 0);


            gg.Flush();

            String path2 = path.Replace("D:\\JAVA_งานน้องตี้\\HTMLPad\\img\\", "D:\\JAVA_งานน้องตี้\\HTMLPad\\img2\\") ;
             if (!  Directory .Exists ( Path.GetDirectoryName (path2 ) ))
             {
                 Directory.CreateDirectory(Path.GetDirectoryName(path2));
             }
            bmp.Save(path2, System.Drawing.Imaging.ImageFormat.Jpeg);
        }

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