C#验证代理Ip地址

码上来了？

命名空间：
using System.Net;
using System.Text;

        /// <summary>
/// 验证IP地址
/// </summary>
/// <param name="str">Ip地址</param>
/// <param name="port">端口号</param>
public static void yanzhen(string str, int port)
        {
try
            {
                WebProxy proxyObject = new WebProxy(str, port);//str为IP地址 port为端口号
                HttpWebRequest Req = (HttpWebRequest)WebRequest.Create("http://www.ip138.com/");
                Req.Proxy = proxyObject; //设置代理
                Req.Timeout = 30000;
                HttpWebResponse Resp = (HttpWebResponse)Req.GetResponse();
string OkStr = "";
                Encoding code = Encoding.GetEncoding("UTF-8");
using (StreamReader sr = new StreamReader(Resp.GetResponseStream(), code))
                {
if (sr != null)
                    {
                        Console.WriteLine(string.Format("验证成功：IP：{0}\t端口：{1}",str,port));
                    }
                }
            }
catch(Exception ex)
            {
                delete(str);
            }
        }