HttpGet/HttpPost请求方法

/// <summary>
        /// HttpGet请求
        /// </summary>
        /// <param name="url">HttpGet</param>
        /// <returns></returns>
        static string HttpGet(string url)
        {
            //Request
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = "GET";
            request.ContentType = "text/html;charset=UTF-8";

            //Response
            string retString = null;
            using (var response = (HttpWebResponse)request.GetResponse())
            {
                using (var myResponseStream = response.GetResponseStream())
                using (var myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8")))
                {
                    retString = myStreamReader.ReadToEnd();
                }
            }
            return retString;
        }

        /// <summary>
        /// HttpPost请求
        /// </summary>
        /// <param name="url">url</param>
        /// <param name="postDataStr">请求数据</param>
        /// <returns></returns>
        static string HttpPost(string url, string postDataStr)
        {
            //Request
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
            request.ContentLength = Encoding.UTF8.GetByteCount(postDataStr);
            byte[] byteData = Encoding.UTF8.GetBytes(postDataStr);
            using (var myRequestStream = request.GetRequestStream())
            {
                myRequestStream.Write(byteData, 0, byteData.Count());
            }

            //Response
            string retString = null;
            using (var response = (HttpWebResponse)request.GetResponse())
            {
                using (var myResponseStream = response.GetResponseStream())
                using (var myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8")))
                {
                    retString = myStreamReader.ReadToEnd();
                }
            }
            return retString;
        }