.net ช่วยแนะนำแนวทางในการเขียน win app หน่อยคร่า คิดไม่ออกแล้ว

OpenFileDialog opfd = new OpenFileDialog();
            opfd.Filter = "JPEG (*.jpg)|*.jpg|Windows bitmap (*.bmp)|*.bmp|All files|*.*";

            opfd.InitialDirectory = "C:";
            opfd.Title = "Select a picture";


            if (opfd.ShowDialog() == DialogResult.OK)
            {
                 string filenname = System.IO.Path.GetFileName(opfd.FileName);
                 string last = Path.GetExtension(filenname);
                 string path = System.IO.Path.GetDirectoryName(opfd.FileName);
                 this.pictureBox1.Image = new Bitmap(opfd.FileName.ToString());
                 MessageBox.Show(filenname, path);
                 string sourceFile = path + "/" + filenname;
                 string pathPicture = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location) + "\\Picture";
                 string destFile = pathPicture + "\\" + label23.Text + last;
                 if (!Directory.Exists(pathPicture))
                 {
                     Directory.CreateDirectory(pathPicture);
                 }
                 File.Delete(destFile);

                 if (!File.Exists(destFile))
                 {
                     File.Copy(sourceFile, destFile);
                     MessageBox.Show("บันทึกข้อมูลเรียบร้อย", "ผลการบันทุกข้อมูล", MessageBoxButtons.OK, MessageBoxIcon.Information);

                 }