C# HttpWebRequest 方式提交数据，参数为普通键值对

private string PostWebRequest(string postUrl, string paramData, Encoding dataEncode)
{
string ret = string.Empty;
try
{
byte[] byteArray = dataEncode.GetBytes(paramData); //转化
HttpWebRequest webReq = (HttpWebRequest)WebRequest.Create(new Uri(postUrl));
webReq.Method = "POST";
webReq.ContentType = "application/x-www-form-urlencoded";

webReq.ContentLength = byteArray.Length;
Stream newStream = webReq.GetRequestStream();
newStream.Write(byteArray, 0, byteArray.Length);//写入参数
newStream.Close();
HttpWebResponse response = (HttpWebResponse)webReq.GetResponse();
StreamReader sr = new StreamReader(response.GetResponseStream(), Encoding.Default);
ret = sr.ReadToEnd();
sr.Close();
response.Close();
newStream.Close();
}
catch (Exception ex)
{
Response.Write(ex.Message);
}
return ret;
}

paramData格式为：a=1&b=2等；

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下面为服务器端接收方法：

加载事件中：
//对应PostWebRequest方法
//Response.Write(string.Format("<?xml version=\"1.0\"?><params><title>{0}</title></params>",Request["a"]));