problem in string value

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace NFAtoDFA
{
    class Program
    {
        public static string[,] ArrOfAllStates = new string[11, 3];
        static string state;
        static string s3;
        public static void Main(string[] args)
        {
            ArrOfAllStates[0, 0] = "1,2,4,7";            //for empty
            ArrOfAllStates[0, 1] = null;              //for a
            ArrOfAllStates[0, 2] = null;              //for b
            //for state 1 of NFA
            ArrOfAllStates[1, 0] = "2,4";            //for empty
            ArrOfAllStates[1, 1] = null;              //for a
            ArrOfAllStates[1, 2] = null;              //for b
            //for state 2 of NFA
            ArrOfAllStates[2, 0] = null;            //for empty
            ArrOfAllStates[2, 1] = "3";              //for a
            ArrOfAllStates[2, 2] = null;              //for b
            //for state 3 of NFA
            ArrOfAllStates[3, 0] = "1,2,4,6,7";            //for empty
            ArrOfAllStates[3, 1] = null;              //for a
            ArrOfAllStates[3, 2] = null;              //for b
            //for state 4 of NFA
            ArrOfAllStates[4, 0] = null;            //for empty
            ArrOfAllStates[4, 1] = null;              //for a
            ArrOfAllStates[4, 2] = "5";              //for b
            //for state 5 of NFA
            ArrOfAllStates[5, 0] = "1,2,4,6,7";            //for empty
            ArrOfAllStates[5, 1] = null;              //for a
            ArrOfAllStates[5, 2] = null;              //for b
            //for state 6 of NFA
            ArrOfAllStates[6, 0] = "1,2,4,7";            //for empty
            ArrOfAllStates[6, 1] = null;              //for a
            ArrOfAllStates[6, 2] = null;              //for b
            //for state 7 of NFA
            ArrOfAllStates[7, 0] = null;            //for empty
            ArrOfAllStates[7, 1] = "8";              //for a
            ArrOfAllStates[7, 2] = null;              //for b
            //for state 8 of NFA
            ArrOfAllStates[8, 0] = null;            //for empty
            ArrOfAllStates[8, 1] = null;              //for a
            ArrOfAllStates[8, 2] = "9,10";              //for b
            //for state 9 of NFA
            ArrOfAllStates[9, 0] = null;            //for empty
            ArrOfAllStates[9, 1] = null;              //for a
            ArrOfAllStates[9, 2] = "10";              //for b
            //for state 10 of NFA
            ArrOfAllStates[10, 0] = null;            //for empty
            ArrOfAllStates[10, 1] = null;              //for a
            ArrOfAllStates[10, 2] = null;              //for b
            ////////////////////////
            Move(E_Closure(0));
        }
        public static string E_Closure(int i)
        {
            Console.Write("Enter state name:");
            state = Console.ReadLine();
            state = ArrOfAllStates[i, 0];
            i++;
            return state;
        }
        public static void Move(string s)
        {
            string[] str = s.Split(',');
            string[] s1=new string[str.Length];
            for(int m=0;m<str.Length;m++)
            s1[m] = ArrOfAllStates[int.Parse(str[m]), 1]+"," + E_Closure(int.Parse(ArrOfAllStates[int.Parse(str[m]), 1]));// exception raised
            
            foreach (string s2 in s1)
                s3 = s2;
            Console.WriteLine("State= {" + s3 + " }");
        }
        
    }
}