using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;

namespace zmeika
{
    public struct elem
    {
        public int x;
        public int y;
    }
    public class Worm
    {
        private elem head;
        private elem tail;
        public LinkedList<elem> list = new LinkedList<elem>();
        public elem Head
        {
            set { head = value; }
            get { return (head); }
        }
        public void DrawHead(elem e)
        {
            list.AddFirst(e);
            Head = list.First; // вот сдесь вылезает ошибка
        }
    }
}