A Beginner's Tutorial on Managing Sequence of Operations in WCF Service

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace TestClient
{
    class Program
    {
        static void Main(string[] args)
        {
            using (ServiceReference1.SampleServiceClient client = new ServiceReference1.SampleServiceClient())
            {
                // let try to call the function that required session to be present
                Console.WriteLine("Scenario 1: let try to call the function that required session to be present");
                try
                {   
                    string result = client.Function2();
                    Console.WriteLine(result);
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.Message);
                }

                // Let us now try to call the terminating function without initating session
                Console.WriteLine();
                Console.WriteLine("Scenario 2: Let us now try to call the terminating function without initating session");
                try
                {
                    string result = client.Function3();
                    Console.WriteLine(result);
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.Message);
                }

                // Now let us call the functions in proper order
                Console.WriteLine();
                Console.WriteLine("Scenario 3:  Now let us call the functions in proper order");
                try
                {
                    string result1 = client.Function1();
                    Console.WriteLine(result1);

                    string result2 = client.Function2();
                    Console.WriteLine(result2);

                    string result3 = client.Function3();
                    Console.WriteLine(result3);
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.Message);
                }


                // Now let us call the function2 again when the session has been terminated
                Console.WriteLine();
                Console.WriteLine("Scenario 4:  Now let us call the function2 again when the session has been terminated");
                try
                {
                    string result1 = client.Function1();
                    Console.WriteLine(result1);

                    string result2 = client.Function2();
                    Console.WriteLine(result2);

                    string result3 = client.Function3();
                    Console.WriteLine(result3);

                    // This should now give us the exception
                    string result2_alt = client.Function2();
                    Console.WriteLine(result2_alt);
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.Message);
                }

            }

            Console.ReadLine();
        }
    }
}