public static void PrintAgentsWithSubscribers(LLAgent agents, LLSubscriber subscribers)
        {
            Node<Agent> agentNode = agents.head;
            while (agentNode != null)
            {
                Console.WriteLine("Agent: {0} {1}", agentNode.Data.Surname, agentNode.Data.Name);
                Console.WriteLine("Assigned Subscribers:");
                Node<Subscriber> subscriberNode = subscribers.head;
                while (subscriberNode != null)
                {
                    if (subscriberNode.Data.AgentCode == agentNode.Data.Code)
                    {
                        Console.WriteLine("{0}", subscriberNode.Data.Surname);
                    }
                    subscriberNode = subscriberNode.Next;
                }
                Console.WriteLine();
                agentNode = agentNode.Next;
            }
        }

public static void PrintAgentsWithSubscribers(LLAgent agents, LLSubscriber subscribers)
        {
            Node<Agent> agentNode = agents.head;
            while (agentNode != null)
            {
                Console.WriteLine("Agent: {0} {1}", agentNode.Data.Surname, agentNode.Data.Name);
                Console.WriteLine("Assigned Subscribers:");
                Node<Subscriber> subscriberNode = subscribers.head;
                while (subscriberNode != null)
                {
                    if (subscriberNode.Data.AgentCode == agentNode.Data.Code)
                    {
                        Console.WriteLine("{0}", subscriberNode.Data.Surname);
                    }
                    subscriberNode = subscriberNode.Next;
                }
                Console.WriteLine();
                agentNode = agentNode.Next;
            }
        }