HttpWebRequest objHttpRequest;
HttpWebResponse objResponse;
WebProxy objProxy;

objHttpRequest = (HttpWebRequest)WebRequest.Create("http://www.baidu.com"); //设定测试页面,用百度来测试
objHttpRequest.Timeout = 3000; //设定超时时间

string ip = "122.72.2.200";
int port = 80;
objProxy = new WebProxy(ips, ports); //创建proxy
objProxy.BypassProxyOnLocal = false;

objHttpRequest.Proxy = objProxy;

 try
        {
            objResponse = (HttpWebResponse)objHttpRequest.GetResponse();//获取答复
            
        }
        catch (Exception)
        {
}