Client for wcf service in console app basic code (using dual tcp to allow callbacks)

Program.cs

using System;
using System.ServiceModel;
using <YOUR_SERVICE_NAMESPACE>;

namespace <YOUR_APP_NAMESPACE>
{
    /// <summary>
    /// This class receives the callbacks from the server.
    /// </summary>
    public class CallbackGetter : <YOUR_SERVICE_CALLBACK_INTERFACE>
    {
        /// <summary>
        /// This method will be invoke from the server.
        /// </summary>
        /// <param name="sms">The message sended by the server.</param>
        public void ServerToClient(string sms)
        {
            Console.WriteLine(string.Format("Callback received: {0}", sms));
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            Service1Client client = null;
            try
            {
                // Create the client with callbacks
                client = new <YOUR_SERVICE_CLIENT>(new InstanceContext(new CallbackGetter()));
                // Test the client
                string result = client.Test(101);
                // Wiat for results
                Console.WriteLine(string.Format("Result: {0}", result));
                Console.WriteLine("Press [ENTER] to exit.");
                Console.ReadLine();
                
            }
            catch (Exception ex)
            {
                // Opus an error occurred
                Console.ForegroundColor = ConsoleColor.Red;
                Console.WriteLine(string.Format("Error:\r\n{0}:\r\n{1}\r\n", ex.GetType(), ex.Message));
                Console.ReadLine();
            }finally
            {
                // Close allways.
                if (client!= null&& 
                    client.State != CommunicationState.Closing &&
                    client.State != CommunicationState.Closing)
                    client.Close();
            }
        }
    }
}