ABNode

using System;

namespace DefaultNamespace
{
    public class ABNode<E>
    {
        private E item;

        public virtual E Item
        {
            get
            {
                return this.item;
            }
            set
            {
                this.item = value;
            }
        }
        private ABNode<E> left;

        public virtual ABNode<E> Left
        {
            get
            {
                return this.left;
            }
            set
            {
                this.left = value;
            }
        }
        private ABNode<E> right;

        public virtual ABNode<E> Right
        {
            get
            {
                return this.right;
            }
            set
            {
                this.right = value;
            }
        }
        // constructor
        public ABNode(E item = default(E), ABNode<E> left = null, ABNode<E> right = null)
        {
            this.Item = this.item;
            this.Left = this.left;
            this.Right = this.right;
        }

        public virtual void Visit()
        {
            Console.WriteLine("{0} ", this.Item.ToString());
        }
    }
}