I just ran up against a requirement to do a deep file and folder/directory copy in .NET (C# to be exact). A quick google didn't turn up any code, so I figured I'd post what I came up with. This is a somewhat naive implementation that may run out of steam for very deep folders or 1000s of files, but works great for most things. This implementation takes a source folder and a destination folder and copies the entire structure including files and folders from the source folder to the destination.

So without further ado:

private void CopyFolder(string folder, string destFolder)
{
  Directory.CreateDirectory(destFolder);

  foreach (string file in Directory.GetFiles(folder, "*.*", SearchOption.AllDirectories))
  {
    string fileName = Path.GetFileName(file);
    string filePath = Path.GetDirectoryName(file.Substring(folder.Length + 1));
    string destFilePath;

    if (!string.IsNullOrEmpty(filePath))
    {
      string destFolder = Path.Combine(destFolder, filePath);

      Directory.CreateDirectory(destFolder);

      destFilePath = Path.Combine(destFolder, fileName);
    }
    else
    {
      destFilePath = Path.Combine(destFolder, fileName);
    }        

    File.Copy(file, destFilePath);
  }
}