ASP.NET MD5加密

        /// <summary>
        /// MD5加密
        /// </summary>
        /// <param name="str"></param>
        /// <param name="code"></param>
        /// <returns></returns>
        public static string MD5(string str, int code)
        {
            if (code == 16)
            {
                return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5").ToLower().Substring(8, 16);
            }
            else
            {
                return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5").ToLower();
            }
        }