取得文件夹的大小

   long i;
   string path=Server.MapPath(".\\cc");
   DirectoryInfo dinfo=new DirectoryInfo(path);
   DirectoryInfo[] df=dinfo.GetDirectories();
   foreach(DirectoryInfo din in df)
   {
    foreach(FileInfo finfo in din.GetFiles())
    {
     i+=finfo.Length;
    
    }
   
   }
   TextBox1.Text=i.ToString();