Stupid code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;

namespace ConsoleApplication1
{
    class NewGraph
    {
        private class Node
        {
            public List<List<string>> maingraph= new List<List<string>>();
            public List<string> subgraph = new List<string>();

            public int SizeMG
            {
                get { return maingraph.Count(); }
            }

            public int SizeSG
            {
                get { return subgraph.Count(); }
            }

            private bool[] mas;

            public void SetMas()
            {
                for (int i = 0; i < SizeMG; i++)
                {
                    mas[i] = true;
                }
            }
            public Node(List<List<string>> a)
            {
                maingraph = a;
                mas = new bool[a.Count()];
            }
        }
        private Node graph;
        public NewGraph(string name)
        {
            using (StreamReader fileIn = new StreamReader(name, Encoding.GetEncoding(1251)))
            {
                int n = int.Parse(fileIn.ReadLine());
                List<List<string>> maingraph2 = new List<List<string>>(n);
                List<string> subgraph2 = new List<string>();
                for (int i = 0; i < n; i++)
                {
                    string line = fileIn.ReadLine();
                    subgraph2.Add(line);
                }
                maingraph2.Add(subgraph2);
                graph = new Node(maingraph2);
                graph.maingraph = maingraph2;
                graph.subgraph = subgraph2;
            }
        }
        public void Show()
        {
            for (int i = 0; i < graph.SizeMG; i++)
            {
                for (int j = 0; j < graph.SizeSG; j++)
                {
                    Console.WriteLine("{0,4}", graph.subgraph[j]);
                }
                Console.WriteLine();
            }
        }
    }
}