private void Copy()
    {
        DirectoryInfo dir = new DirectoryInfo("c:\\CSS");
        CopyDirectorysAndFiles("c:\\test", dir);
    }

    private void CopyDirectorysAndFiles(string dest, DirectoryInfo srcdir)
    {
        if (dest.LastIndexOf('\\') != (dest.Length - 1))
        {
            dest += "\\";
        }
        string destPath = dest +srcdir.Name + "\\";
        if (!Directory.Exists(destPath))
        {
           Directory.CreateDirectory(destPath);
        }
        FileInfo[] files = srcdir.GetFiles();
        foreach (FileInfo file in files)
        {
            file.CopyTo(destPath + file.Name, true);
        }
        DirectoryInfo[] dirs = srcdir.GetDirectories();
        foreach (DirectoryInfo dirInfo in dirs)
        {
            CopyDirectorysAndFiles(destPath, dirInfo);
        }
    } 

-----------------------------------
C#拷贝文件原来的文件路径名FileOldPath;
新的文件路径名:FileNewPath,
那就可以用

File.Move(FileOldPath,FileNewPath) 
或者File.Copy(FileOldPath,FileNewPath) 
注意的是这里的路径是文件夹路径+文件名,可以用Path.Combine()来实现
----------------------------------
一般是先复制，再删除~

System.IO.File.Move(File, newfile); 
System.IO.File.Copy(File, newfile); 
System.IO.File.Detele(File);