HttpWebRequest 报错The remote name could not be resolved 怎么改掉？？？

using System;

using System.IO;

using System.Net;

using System.Text;

class Spider

{

    public static void Main(string[] args)

    {

        if (args.Length == 0)

        {

            Console.Write("请输入url！");

            return;

        }

        string url = args[0];

        Encoding e = Encoding.Default;//默认为gb

        if (args.Length == 2)

        {

            try

            {

                e = Encoding.GetEncoding(args[1]);//获取传递的编码

            }

            catch { e = null; }

        }

        if (e == null)

        {

            Console.Write("输入的编码错误！");

            return;

        }

        string result = string.Empty;

        try

        {

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();

            StreamReader reader = new StreamReader(response.GetResponseStream(), e);

            result = reader.ReadToEnd();

            reader.Close();

        }

        catch (Exception ex)

        {

            Console.Write(string.Format(@" 服务器获取文件内容出错：{0} ", ex.Message));

        }



        Console.Write(result);

    }

}