private static void Main(string[] args)
{
    string accessKeyId = "xxx";
    string secretAccessKey = "xxx";

    BceClientConfiguration config = new BceClientConfiguration();
    config.Credentials = new DefaultBceCredentials(accessKeyId, secretAccessKey);
    config.Endpoint = "http://smsv3.bj.baidubce.com";
    // 设置HTTP最大连接数为10
    config.ConnectionLimit = 10;
    // 设置TCP连接超时为5000毫秒
    config.TimeoutInMillis = 5000;
    // 设置读写数据超时的时间为50000毫秒
    config.ReadWriteTimeoutInMillis = 50000;

    SmsClient client = new SmsClient(config);

    SendMessageRequest request = new SendMessageRequest();
    request.Mobile = "18800000000";
    request.SignatureId = "sms-sign-xxx";
    request.Template = "sms-tmpl-xxx";
    request.ContentVar = new Dictionary<string, string>
    {
        {
            "content", "测试"
        }

    }
    SendMessageResponse response = client.SendMessage(request);
    Console.Write(response.BceRequestId);
}