static void Main(string[] args)
{
// Find your Account Sid and Auth Token at twilio.com/user/account
string AccountSid = "ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
string AuthToken = "your_auth_token";
var twilio = new TwilioRestClient(AccountSid, AuthToken);
var options = new ApplicationOptions();
options.VoiceUrl = "http://demo.twilio.com/docs/voice.xml";
options.SmsUrl = "http://demo.twilio.com/docs/sms.xml";
twilio.UpdateApplication("AP2a0747eba6abf96b7e3c3ff0b4530f6e", null, options);
}