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 callerId = twilio.AddOutgoingCallerId("+14158675309", "My Home Phone Number", null, null);
Console.WriteLine(callerId.ValidationCode);
}