Install-Package Twilio

Install-Package Twilio.Mvc

using Twilio;
var twilio = new TwilioRestClient("accountSid", "authToken");
var call = twilio.InitiateOutboundCall("+1555456790", "+15551112222", "http://example.com/handleCall");
var msg = twilio.SendSmsMessage("+15551112222", "+15553334444", "Can you believe it's this easy to send an SMS?!");

using Twilio;
var twilio = new TwilioRestClient("accountSid", "authToken");
twilio.InitiateOutboundCall("+1123456790", "+15555551212", "http://example.com/handleCall", (call) => {
    // Console.WriteLog(call.Sid);
});

twilio.SendSmsMessage("+15555551212", "+11234567890", "Hello!", (msg) => {
    // Console.WriteLine(msg.Sid);
});

var response = new TwilioResponse();
response.Say("Hello Monkey");
response.Play("http://demo.twilio.com/hellomonkey/monkey.mp3");
response.BeginGather(new { numDigits = 1, action = "hello-monkey-handle-key.cshtml", method = "POST" });
response.Say("To speak to a real monkey, press 1. Press 2 to record your own monkey howl. Press any other key to start over.");
response.EndGather();

// ASP.NET MVC when controller inherits from TwilioController
return TwiML(response);

// ASP.NET MVC regular controller
return new TwiMLResult(response);

// ASP.NET Webforms
var doc = response.ToXDocument();
Response.ContentType = "application/xml";
doc.Save(Response.Output);