В экземпляре объекта не задана ссылка на объект - C# (207904)

class ochered//<T0>
    {
        private ochered[] masOhcer;
        public ochered()
        {
            //ochered[] masOcher = new ochered[10];
        }
        public void enqueue(ochered person)
        {
            for (int i = 0; i <= masOhcer.Length; i++)
            {
                if (masOhcer[i] == null)
                    masOhcer[i] = person;
            }
        }      
        public void dequeeue()
        {
            if (masOhcer[9] != null)
            {
                masOhcer[0] = null;
                if (masOhcer[0] == null)
                    for (int i = 0; i <= masOhcer.Length; i++)
                        masOhcer[i] = masOhcer[i - 1];
            }
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            ochered[] masOcher = new ochered[10];
            ochered person=new ochered();
            masOcher[0] = person;
            person.enqueue(person);
            person.dequeeue();           
            Console.ReadKey();
        }
    }