C#在vs里用控制台应用程序怎样进行网页抓取

C#在vs里用控制台应用程序怎样进行抓取网页中的一些值，并输出到日志文件中

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 WebRequest request = WebRequest.Create("https://detail.tmall.com/item.htm?id=558760911386&spm=a21bz.7725273.1998564503.1.20c03db8iSnBxd&umpChannel=qianggou&u_channel=qianggou&sku_properties=10004:709990523;5919063:6536025;12304035:3222911"); 
WebResponse response = (WebResponse)request.GetResponse();    
Stream dataStream = response.GetResponseStream();StreamReader reader = new StreamReader(dataStream, Encoding.Default);string sr = reader.ReadToEnd();

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