// Download the twilio-csharp library from twilio.com/docs/csharp/install
using System;
using Twilio;
class Example 
{
  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);
  }
}