A Simple State Machine

using System;

namespace AbstractFSM
{
    public class StateEventArgs : EventArgs
    {
        public StateEventArgs(int id)
        {
            m_id = id;
        }
        private int m_id;
        public int Id
        {
            get { return m_id; }
        }
    }

    public class State
    {
        private String m_sState = null;
        public State(string sState)
        {
            m_sState = sState; 
        }
        protected virtual void ChangeState(object sender, StateEventArgs eventArgs) {}

        public override string ToString()
        {
            return m_sState;
        }
    }
}