用DOM实现文章采集--采集到网页源码

先来个采集网页的代码。
[csharp]
using System; 
using System.Collections.Generic; 
using System.IO; 
using System.IO.Compression; 
using System.Net; 
using System.Text; 
namespace TopWinCMS.Common 
{ 
    public class NetHelper 
    { 
 
        //private string _HTTP_USER_AGENT = "Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.2;+SV1;+.NET+CLR+1.1.4322;+.NET+CLR+2.0.50727)"; 
        private string _UserAgent = "Googlebot/2.1 (+http://www.google.com/bot.html)"; 
        private Encoding _HttpEncoding = null; 
        private string _ProxyHost = string.Empty; 
        private int _ProxyInt = 8080; 
        private int _TimeOut = 200000; 
 
        #region 属性 
        /// <summary> 
        /// 设置UserAgent 
        /// </summary> 
        public string UserAgent 
        { 
            get 
            { 
                return this._UserAgent; 
            } 
            set 
            { 
                this._UserAgent = value; 
            } 
        } 
        /// <summary> 
        /// 设置编码 
        /// </summary> 
        public Encoding HttpEncoding 
        { 
            get 
            { 
                return this._HttpEncoding; 
            }