webclient 和 webrequest获取网页源码的

private void WebClientButton_Click(object sender, System.EventArgs e)
{
PageUrl = UrlText.Text;
WebClient wc = new WebClient();
wc.Credentials = CredentialCache.DefaultCredentials;

///方法一：
Byte[] pageData = wc.DownloadData(PageUrl);
ContentHtml.Text = Encoding.Default.GetString(pageData);

/// 方法二：
/// ***************代码开始**********
/// Stream resStream = wc.OpenRead(PageUrl);
/// StreamReader sr = new StreamReader(resStream,System.Text.Encoding.Default);
/// ContentHtml.Text = sr.ReadToEnd();
/// resStream.Close();
/// **************代码结束********
///
wc.Dispose();
}

private void WebRequestButton_Click(object sender, System.EventArgs e)
{
PageUrl = UrlText.Text;
WebRequest request = WebRequest.Create(PageUrl);
WebResponse response = request.GetResponse();
Stream resStream = response.GetResponseStream();
StreamReader sr = new StreamReader(resStream, System.Text.Encoding.Default);
ContentHtml.Text = sr.ReadToEnd();
resStream.Close();
sr.Close();
}