I need a copy file on folder to another folder and i'm use this

```
  string[] files = Directory.GetFiles(folderBrowserDialog1.SelectedPath);
            foreach (string file in files)
            {
                folderBrowserDialog1.ShowDialog();
                string xx = folderBrowserDialog1.SelectedPath;
                folderBrowserDialog1.ShowDialog();
                string yy = folderBrowserDialog1.SelectedPath;
                File.Copy(xx, yy);

```

But is not working.
Why?