用戶端下載 解決亂碼

//Response給用戶端下載
        Response.Clear();
        Response.ContentEncoding = System.Text.Encoding.GetEncoding("UTF-8"); //解決中文亂碼
        Response.AddHeader("content-disposition", "attachment; filename=" + Server.UrlPathEncode("中文中文.pdf"));//強制下載
        Response.ContentType = "application/octet-stream";
        Response.BinaryWrite(file);