C# State thing

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace OOP14_BehaviourPatternsState
{
    class Program
    {
        static void Main(string[] args)
        {
        }
    }

    interface IDFAState
    {
        void q0(); // Start
        void q1();
        void q2();
        void q3(); // Accept

        void
    }

    /*
    class DFAState : IDFAState
    {

        private DFA _dfa;

        public DFAState(DFA dfa)
        {
            _dfa = dfa;
        }

        public void q0() { }
        public void q1() { }
        public void q2() { }
        public void q3() { }
    }*/

    class q0State : IDFAState
    {
        private DFA _dfa;

        public q0State(DFA dfa)
        {
            _dfa = dfa;
        }

        public void q0() { }
        public void q1() { }
        public void q2() { }
        public void q3() { }
    }

    class q1State : IDFAState
    {
        private DFA _dfa;

        public q1State(DFA dfa)
        {
            _dfa = dfa;
        }

        public void q0() { }
        public void q1() { }
        public void q2() { }
        public void q3() { }
    }

    class q2State : IDFAState
    {
        private DFA _dfa;

        public q2State(DFA dfa)
        {
            _dfa = dfa;
        }

        public void q0() { }
        public void q1() { }
        public void q2() { }
        public void q3() { }
    }

    class q3State : IDFAState
    {
        private DFA _dfa;

        public q3State(DFA dfa)
        {
            _dfa = dfa;
        }

        public void q0() { }
        public void q1() { }
        public void q2() { }
        public void q3() { }
    }

    class DFA
    {
        public readonly q0State _q0state;
        public readonly q1State _q1state;
        public readonly q2State _q2state;
        public readonly q3State _q3state;

        public IDFAState state;

        public DFA()
        {
            _q0state = new q0State(this);
            _q1state = new q1State(this);
            _q2state = new q2State(this);
            _q3state = new q3State(this);
            state = _q0state;
        }

        public string Input { get; set; }

        public bool Check()
        {
            return true;
        }

        public void NextState(int pos)
        {

        }
    }
}