怎么判断网页的编码

如何判断网页的编码
用如下方法获取网页html代码,可如何识别该网页的编码呢?
Dim   buf(1000000)   As   Byte
                        Dim   request   As   HttpWebRequest   =   WebRequest.Create( "http://127.0.0.1/hhzp ")
                        Dim   response   As   HttpWebResponse   =   request.GetResponse()
                        Dim   resStream   As   Stream   =   response.GetResponseStream()
                        Dim   count   As   Integer   =   resStream.Read(buf,   0,   buf.Length)
                        Dim   htmlstr   As   String   =   Encoding.Default.GetString(buf,   0,   count)   '这里的str就是你要的网页代码
                        resStream.Close()

------解决方案--------------------
string contenttype = response.Headers[ "Content-Type "];
if( contenttype != " ")
{
encoding = contenttype.Substring(contenttype.LastIndexOf( "= ")+1);
}


if(encoding == " ")
sr= new StreamReader(resStream, System.Text.Encoding.Default);
else
{
sr= new StreamReader(resStream, System.Text.Encoding.GetEncoding(encoding));
}
htmlstr = sr.ReadToEnd();

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最新版本：20070210

http://www.cnblogs.com/feiyun0112/archive/2006/09/20/509783.html