System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

TwilioClient.Init("ACCOUNT_SID", "AUTH_TOKEN");

var call = CallResource.Create(
    new PhoneNumber("+11234567890"),
    from: new PhoneNumber("+10987654321"),
    url: new Uri("https://my.twiml.here")
);
Console.WriteLine(call.Sid);

var message = MessageResource.Create(
    new PhoneNumber("+11234567890"),
    from: new PhoneNumber("+10987654321"),
    body: "Hello World!"
);
Console.WriteLine(message.Sid);

// TwiML classes can be created as standalone elements
var gather = new Gather(numDigits: 1, action: new Uri("hello-monkey-handle-key.cshtml"), method: HttpMethod.Post)
    .Say("To speak to a real monkey, press 1. Press 2 to record your own monkey howl. Press any other key to start over.");

// Attributes can be set directly on the object
gather.Timeout = 100;
gather.MaxSpeechTime = 200

// Arbitrary attributes can be set by calling set/getOption
var dial = new Dial().SetOption("myAttribute", 200)
                     .SetOption("newAttribute", false);

// Or can be created and attached to a response directly using helper methods
var response = new VoiceResponse()
    .Say("Hello Monkey")
    .Play(new Uri("http://demo.twilio.com/hellomonkey/monkey.mp3"))
    .Append(gather)
    .Append(dial);
    
// Serialize the TwiML objects to XML string
Console.WriteLine(response);

/*
<?xml version="1.0" encoding="utf-8"?>
<Response>
  <Say>Hello Monkey</Say>
  <Play>http://demo.twilio.com/hellomonkey/monkey.mp3</Play>
  <Gather numDigits="1" action="hello-monkey-handle-key.cshtml" method="POST" timeout="100" maxSpeechTime="200">
    <Say>To speak to a real monkey, press 1. Press 2 to record your own monkey howl. Press any other key to start over.</Say>
  </Gather>
  <Dial myAttribute="200" newAttribute="false"></Dial>
</Response>
*/