public void SendSms(string PhoneNumbers)
        {
            var verifyCode = GetVerifyCode();
            JObject jObject = new JObject();
            jObject.Add("code", verifyCode);
            AlibabaCloud.SDK.Dysmsapi20170525.Client client = CreateClient("accessKeyId", "accessKeySecret");
            AlibabaCloud.SDK.Dysmsapi20170525.Models.SendSmsRequest sendSmsRequest = new AlibabaCloud.SDK.Dysmsapi20170525.Models.SendSmsRequest
            {
                PhoneNumbers = PhoneNumbers,
                SignName = "SignName",
                TemplateCode = "TemplateCode",
                TemplateParam = jObject.ToString()
            };
            SendSmsResponse sendSmsResponse = client.SendSms(sendSmsRequest);
            if (sendSmsResponse.Body.Code == "OK" && sendSmsResponse.Body.Message == "OK")
            {
                textEdit1.Text = sendSmsResponse.Body.BizId;
                SetCacheTimeSpan(sendSmsResponse.Body.BizId, verifyCode, 20);
            }
            else if("isv.BUSINESS_LIMIT_CONTROL".Equals(sendSmsResponse.Body.Code))
            {
                throw new Exception("获取验证码过于频繁");
            }
        }


        public static AlibabaCloud.SDK.Dysmsapi20170525.Client CreateClient(string accessKeyId, string accessKeySecret)
        {
            AlibabaCloud.OpenApiClient.Models.Config config = new AlibabaCloud.OpenApiClient.Models.Config
            {
                AccessKeyId = accessKeyId,
                AccessKeySecret = accessKeySecret,
            };
            config.Endpoint = "dysmsapi.aliyuncs.com";
            return new AlibabaCloud.SDK.Dysmsapi20170525.Client(config);
        }


        /// <summary>
        /// 生成6位数随机验证码
        /// </summary>
        /// <returns></returns>
        private static int GetVerifyCode()
        {
            Random random = new Random();
            return random.Next(100000, 999999);
        }

        /// <summary>
        /// 设置缓存相对过期时间
        /// </summary>
        /// <param name="cacheKey">key</param>
        /// <param name="objValue">缓存对象</param>
        /// <param name="timeSpan">过期时间（秒）</param>
        public static void SetCacheTimeSpan(string cacheKey, object objValue, long timeSpan)
        {
            System.Web.Caching.Cache objCache = HttpRuntime.Cache;
            objCache.Insert(cacheKey, objValue, null, DateTime.MaxValue, TimeSpan.FromSeconds(timeSpan));
        }


        /// <summary>
        /// 获取Cache的value
        /// </summary>
        /// <param name="cacheKey"></param>
        /// <returns></returns>
        public object GetCacheValue(string cacheKey)
        {
            System.Web.Caching.Cache objCache = HttpRuntime.Cache;
            return objCache.Get(cacheKey);
        }

            SendSms(PhoneNumbers);