获取网页中的验证码图片之二

使用前引用命名空间
System.net;

        public string DownLoadFile()
        {
            string address = "https://ab.login.yahoo.com/img/uqS.puVZFenOtCHGdraSMM6XaYQRJbquZZROZ4N5XJgbY4YSlyPQnrocNx9RIA4NxuFtfivDNUE-.jpg";
            string fileName = @"D:\" + DateTime.Now.ToString("yyyyMMddhhmmss") + ".jpg";
            WebClient client = new WebClient();
            client.DownloadFile(address, fileName);

            return fileName;
        }