读取网页源代码

using System.Net;

using System.IO;

using System.Text;

...   

byte[] buf = new byte[50000];
   HttpWebRequest request = (HttpWebRequest)
    WebRequest.Create(textBox1.Text);
   HttpWebResponse response = (HttpWebResponse)
    request.GetResponse();
   Stream resStream = response.GetResponseStream();
   int count = resStream.Read(buf, 0, buf.Length);
   this.richTextBox1.Text = Encoding.Default.GetString(buf, 0,
    count);
   resStream.Close();