private static void SendSMS(FlowrouteNumbersAndMessagingClient client, string from_did, string to_did, string callback = null) { Message msg = new Message(); msg.From = from_did; msg.To = to_did; // Replace with your mobile number to receive messages sent from your Flowroute account msg.Body = "Hi Chris"; msg.Callback = callback; MessagesController messages = client.Messages; string result = messages.CreateSendAMessage(msg); Console.WriteLine(result); }