CS里如何向URL提交数据 POST方式_ASP.NET

CS里怎么向URL提交数据 POST方式
在CS里怎么向URL提交数据而且是以POST的方式？

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C# code

            string html = null;            string url = "http://china.alibaba.com/keyword/promotion.htm?catId=14";            WebRequest req = WebRequest.Create(url);            req.Method = "POST";            WebResponse res = req.GetResponse();            Stream receiveStream = res.GetResponseStream();            Encoding encode = Encoding.GetEncoding("gb2312");            StreamReader sr = new StreamReader(receiveStream, encode);            char[] readbuffer = new char[256];            int n = sr.Read(readbuffer, 0, 256);            while (n > 0)            {                string str = new string(readbuffer, 0, n);                html += str;                n = sr.Read(readbuffer, 0, 256);            }            System.Console.Write(html);
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传递数据看看这个
http://blog.163.com/zhangqing_007@126/blog/static/37360989200981052745903/
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ls的比较详细++
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mngzilin 这个讲的很详细,赞一个.