/* Holds the contact information
     * a simple class that hold an individual's contact information including
     * their name, address, phone number, and website address.
     */
    class Addr
    {
        /* All internal names have a get and set method */

        /* the persons name 
         * @visibe private
         * @type string
         */
        private string name
        {
            get { return name; }
            set { name = value; }
        }

        /* the person's address
         * @visibe private
         * @type string
         */
        private string address
        {
            get { return address; }
            set { name = value; }
        }

        /* The person's phone number
         * @visibe private
         * @type string
         */
        private string phone
        {
            get { return phone; }
            set { phone = value; }
        }

        /* the person's website url
         * @visibe private
         * @type string
         */
        private string website
        {
            get { return website; }
            set { website = value; }
        }

        /* constructor
         * name, address, phone and website provided for the constructor.  Overloaded
         * 
         * @param string name
         * @param string address
         * @param string phone
         * @param string website
         * @visible public
         */
        public Addr(string name, string address, string phone, string website) {}
        public Addr(string name, string address, string phone) :this(name, address, phone, "") {}
        public Addr(string name, string address) : this(name, address, "", "") {}
        public Addr(string name) :this(name, "", "", "")
        {
            this.name = name;
            this.address = address;
            this.phone = phone;
            this.website = website;
        }

    /* holds the various Addr objects 
     * a collection of the various Addr objects in one easy to use book.  You can add,
     * delete, modify, and retreive individual addresses as well as all of them at once.
     */
    class AddrBook : ArrayList
    {
        /* var to hold the collection of Addr
         * 
         * @visible private
         * @type ArrayList
         */
        private ArrayList book;

        ....        

        public string findOne(string name)
        {
            int? index = this._search(name);
            if (index != null)
            {
                return book[index].ToString();
            }
            else
            {
                return null;
            }
        }
 
        .....
       
        public override string ToString()
        {
            return base.ToString();
        }
    }