◆c#下载保存到指定文件夹◆

filename = HandleFileName(filename);
Response.Clear();
Response.ClearHeaders();
Response.Buffer = false;
Response.AddHeader("Content-Disposition",
String.Format("attachment;filename={0}", filename));
Byte[] buffer = (byte[])doc.Article;
Response.OutputStream.Write(buffer, 0, buffer.Length);
Response.Flush();
Response.End();用以上的方法如何把文件下载保存到指定文件夹？上面的方法是不是不支持批量下载？谢谢！