c#模拟http post请求

前段时间写快递查询，用的是快递鸟的接口，需要后台模拟post请求，现将代码上传如下：

 try

            {

                var postDataStr = "EBusinessID=" + EBusinessID + "&RequestData=" + RequestData + "&RequestType=" + RequestType + "&DataSign=" + DataSign + "&DataType=" + DataType + "";

                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);

                request.Method = "POST";

                request.ContentType = "application/x-www-form-urlencoded";

                request.ContentLength = Encoding.UTF8.GetByteCount(postDataStr);

                //request.CookieContainer = cookie;

                Stream myRequestStream = request.GetRequestStream();

                StreamWriter myStreamWriter = new StreamWriter(myRequestStream, Encoding.GetEncoding("gb2312"));

                myStreamWriter.Write(postDataStr);

                myStreamWriter.Close();

                HttpWebResponse response = (HttpWebResponse)request.GetResponse();

                Stream myResponseStream = response.GetResponseStream();

                StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));

                string retString = myStreamReader.ReadToEnd();

                myStreamReader.Close();

                myResponseStream.Close();

                return retString;

            }

            catch

            {

                return "查询失败";

            }

不喜勿喷，只是自己做的笔记。