post提交及MD5加密

C# POST提交  

  /// <summary>
        /// post 网址提交
        /// </summary>
        /// <param name="postUrl">提交网站</param>
        /// <param name="paramData">参数</param>
        /// <param name="dataEncode">编码方式</param>
        /// <returns></returns>
        public static 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)
            {
                ret = ex.Message;
               
            }
            return ret;
        }

C# MD5 加密方法 16位或32位

  public string md5(string str,int code)
  {
    if(code==16) //16位MD5加密（取32位加密的9~25字符）
   {
       return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str,"MD5").ToLower().Substring(8,16) ;
   } 
   else//32位加密
   {
       return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str,"MD5").ToLower();
   } 
 }