using System;
using System.IO;
using System.Net;
using System.Text;

namespace ConsoleApplication1
{
    public static class HttpHelper
    {
        private static readonly Encoding DEFAULTENCODE = Encoding.UTF8;

        /// <summary>
        /// Http get
        /// </summary>
        /// <param name="url"></param>
        /// <param name="data"></param>
        /// <returns></returns>
        public static string Get(string url, string data)
        {
            return Get(url, data, DEFAULTENCODE);
        }

        /// <summary>
        /// Http get
        /// </summary>
        /// <param name="url"></param>
        /// <param name="data"></param>
        /// <param name="encoding"></param>
        /// <returns></returns>
        public static string Get(string url, string data, Encoding encoding)
        {
            return Get(url, data, encoding, new CookieContainer());
        }

        /// <summary>
        /// Http get
        /// </summary>
        /// <param name="url"></param>
        /// <param name="data"></param>
        /// <param name="encoding"></param>
        /// <param name="cookieContainer"></param>
        /// <returns></returns>
        public static string Get(string url, string data, Encoding encoding, CookieContainer cookieContainer)
        {
            url = string.Format("{0}?{1}", url, data);
            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
            request.Method = "GET";
            //request.UserAgent = "";
            //request.Referer = "";
            //request.Proxy = null; //不使用代理，防止监听
            //request.Proxy = new WebProxy("14.17.29.112", 80);                
            request.CookieContainer = cookieContainer;
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            using (StreamReader stream = new StreamReader(response.GetResponseStream(), encoding))
            {
                return stream.ReadToEnd();
            }
        }

        /// <summary>
        /// Http post
        /// </summary>
        /// <param name="url"></param>
        /// <param name="data"></param>
        /// <returns></returns>
        public static string Post(string url, string data)
        {
            return Post(url, data, DEFAULTENCODE);
        }

        /// <summary>
        /// Http post
        /// </summary>
        /// <param name="url"></param>
        /// <param name="data"></param>
        /// <param name="encoding"></param>
        /// <returns></returns>
        public static string Post(string url, string data, Encoding encoding)
        {
            return Post(url, data, encoding, new CookieContainer());
        }

        /// <summary>
        /// Http post
        /// </summary>
        /// <param name="url"></param>
        /// <param name="data"></param>
        /// <param name="encoding"></param>
        /// <param name="cookieContainer"></param>
        /// <returns></returns>
        public static string Post(string url, string data, Encoding encoding, CookieContainer cookieContainer)
        {
            byte[] bytes = encoding.GetBytes(data);
            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
            request.ContentLength = bytes.Length;
            //request.UserAgent = "";
            //request.Referer = "";
            //request.Proxy = null; //不使用代理，防止监听
            //request.Proxy = new WebProxy("14.17.29.112", 80);
            request.CookieContainer = cookieContainer;
            using (Stream stream = request.GetRequestStream())
            {
                stream.Write(bytes, 0, bytes.Length);
            }
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            using (StreamReader stream = new StreamReader(response.GetResponseStream(), encoding))
            {
                return stream.ReadToEnd();
            }
        }
    }
}

using System;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(HttpHelper.Get("http://www.mzwu.com/article.asp", "id=1&t=1000"));
            Console.ReadKey();
        }
    }
}