怎样获取一个网页本身的html代码？该如何处理

怎样获取一个网页本身的html代码？
如我在A.aspx 怎样获取B.aspx的html的代码。如我们用记事本察看网页，获取的那些代码一样。

------解决方案--------------------------------------------------------
 
string url="http://163.ifcast.ifocus.cn/";
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
try
{
using (HttpWebResponse res = (HttpWebResponse)req.GetResponse())
{
using (StreamReader sr = new StreamReader(res.GetResponseStream(), Encoding.Default))
{
return sr.ReadToEnd();
}
}
}
catch (System.Exception e)
{
return @"Error";
}
finally
{
req.Abort();
}
}
------解决方案--------------------------------------------------------
public static string GetHttpSourceValue(string a_strUrl)
{

string strResult;
HttpWebRequest myReq = (HttpWebRequest)WebRequest.Create(new System.Uri(a_strUrl));



myReq.Method = "GET";
myReq.Accept = "*/*";
myReq.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727)";//下载网页源码
// System.Threading.Thread.Sleep(1000);
try
{
HttpWebResponse HttpWResp = (HttpWebResponse)myReq.GetResponse();

string tmp = myReq.Headers.ToString();

Stream myStream = HttpWResp.GetResponseStream();

StreamReader sr = new StreamReader(myStream, Encoding.Default);
StringBuilder strBuilder = new StringBuilder();
while (-1 < sr.Peek())
{
strBuilder.Append(sr.ReadLine() + "\r\n");
}

strResult = strBuilder.ToString();
// StreamWriter sw = new StreamWriter("E:\\1.txt", false, Encoding.Default);
// sw.Write(strResult);


myStream.Close();
sr.Close();
// sw.Close();
}
catch (Exception exp)
{
strResult = "错误：" + exp.Message;
}


return strResult;




// StreamWriter sw = new StreamWriter(SaveFileName(), false, Encoding.Default);
// sw.Write(body);
// sw.Close();
}
------解决方案--------------------------------------------------------

C# code

 /// <summary>        /// 获取网页源文件        /// </summary>        /// <param name="url">网页地址</param>        /// <param name="charset">网页编码类型 如：gb2312</param>        /// <returns>返回网页源文件</returns>        public static string GetSnatchHtml(string url, string charset)        {            string pageHtml = "";            try            {                HttpWebRequest myHttpWebRequest = (HttpWebRequest)HttpWebRequest.Create(url);                myHttpWebRequest.Method = "GET";                myHttpWebRequest.Timeout = 30000;   //设置超时时间                HttpWebResponse myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();                Stream receiveStream = myHttpWebResponse.GetResponseStream();                StreamReader readStream = new StreamReader(receiveStream, Encoding.GetEncoding(charset.ToLower()));                string returnVal = readStream.ReadToEnd().Trim();                readStream.Close();                receiveStream.Close();                return returnVal;            }            catch (Exception ee)            {                string s = url + ":" + ee.Message + ";" + ee.Source + ";" + ee.StackTrace + ";";            }            return pageHtml;        }
------解决方案--------------------------------------------------------