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

PageUrl = "http://www.webkaka.com"; //獲取源代碼的網(wǎng)頁
WebClient wc = new WebClient(); // 創(chuàng)建WebClient實例提供向URI 
wc.Credentials = CredentialCache.DefaultCredentials; // 獲取或設(shè)置Internet 請求進(jìn)行身份驗證的網(wǎng)絡(luò)憑據(jù)。

Encoding enc = Encoding.GetEncoding("GB2312"); // 亂碼就改成 utf-8 或 GB2312
Byte[] pageData = wc.DownloadData(PageUrl); 
ContentHtml.Text = enc.GetString(pageData); // 輸出字符串HTML代碼

public static WebRequest Create
(
　 string requestUriString
)

public virtual WebResponse GetResponse ()

　　返回值：對Internet請求的響應(yīng)的WebResponse。

using System.IO;
using System.Net;
using System.Text;
PageUrl = "http://www.webkaka.com"; //獲取源代碼的網(wǎng)頁
WebRequest request = WebRequest.Create(PageUrl); //返回WebRequest的子類HttpWebRequest
WebResponse response = request.GetResponse(); //返回對 Internet 請求的響應(yīng)
Stream resStream = response.GetResponseStream(); //從 Internet 資源返回數(shù)據(jù)流。?
Encoding enc = Encoding.GetEncoding("GB2312"); // 亂碼就改成 utf-8 / GB2312
StreamReader sr = new StreamReader(resStream, enc); //以一種特定的編碼從字節(jié)流中讀取字符。?
ContentHtml.Text = sr.ReadToEnd(); //輸出HTML代碼
sr.Close();