class Boat
    {
        // Attributes
        private string _name;

        // Constructors
        public Boat(string name)
        {
            _name = name;
        }

        // Properties
        public string Name
        {
            get { return _name; }
            set { _name = value; }
        }

        // Methods
    }


    class Harbour
    {   // Start of class

        // Attributes
        private List<Boat> _boats;

        // Constructors
        public Harbour()
        {
            _boats = new List<Boat>();
        }

        // Properties

        // Methods

        public void Dock(Boat boat)
        {
            _boats.Add(boat);       // Store Boat object on list
        }

        public Boat FindByName(string name)
        {
            foreach (Boat boat in _boats)
            {
                if (boat.Name == name)
                {
                    return boat;    // Found boat
                }
            }
            return null;    // No Boat object exists for this name
        }

    } // End of Class


        static void Main(string[] args)
        {
            Boat boat;
            Harbour harbour;

            boat = new Boat("Fred");

            harbour = new Harbour();

            harbour.Dock(boat);
            harbour.Dock(new Boat("John"));

            boat = harbour.FindByName("Fred");
            if (boat != null)
            {
                Console.WriteLine("Found the boat {0}", boat.Name);
            }

            boat = harbour.FindByName("RubbishName");
            if (boat == null)
            {
                Console.WriteLine("Boat should be null");
            }
        }