擷取某網頁的原始碼

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;//引入命名空間
using System.Net;//引入命名空間

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        
        private void button2_Click(object sender, EventArgs e)
        {
            StringBuilder strSource = new StringBuilder("");
            try
            {
                WebRequest WReq = WebRequest.Create("www.baidu.com");//需要擷取源碼的網址

                WebResponse WResp = WReq.GetResponse();//返回伺服器的響應
                StreamReader SR = new StreamReader(WResp.GetResponseStream(), Encoding.UTF8);//從資料流中提取資料
                string strTemp = "";
                while ((strTemp = SR.ReadLine()) != null)//行不為空白
                {
                    strSource.Append(strTemp + "\r\n");
                }
                SR.Close();
            }
            catch
            {

            }
            finally {
                 FileStream fs=new FileStream(@"D:\test.txt",FileMode.CreateNew);//建立檔案儲存源碼
                StreamWriter sw = new StreamWriter(fs, Encoding.UTF8);
                sw.Write(strSource);
                sw.Close();
                fs.Close();
            }
        }
    }
}