2D-s tömb elemeinek rendezése listába töltéssel

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

namespace ConsoleApplication1
{
  class Program
  {
    static void attoltes(ref int[,] tomb, ref List<int> lista, ref bool beki)
    {
      int k = 0;
      for (int j = 0; j < tomb.GetLength(0); j++)
      {
        for (int i = 0; i < tomb.GetLength(1); i++)
        {
          if (beki == true)
          {
            lista.Add(tomb[j, i]);
          }
          else
          {
            tomb[j, i] = lista[k++];
          }
        }
      }
    }
    static void rendezes(ref int[,] tomb)
    {
      List<int> lista = new List<int>();
      bool beki = true;
      attoltes(ref tomb, ref lista, ref beki);
      lista.Sort();
      beki = false;
      attoltes(ref tomb, ref lista, ref beki);
    }
    static void tombfeltolt(ref int[,] tomb, Random vel, ref int tombhatar1, ref int tombhatar2)
    {
      int generalt = 0;
      bool talal = false;
      int i;
      generalt = vel.Next(tombhatar1, tombhatar2+1);
      tomb[0, 0] = generalt;
      for (int j = 0; j < tomb.GetLength(0); j++)
      {
        if (j == 0)
        {
          i = 1;
        }
        else
        {
          i = 0;
        }
        for (; i < tomb.GetLength(1); i++)
        {
          do
          {
            talal = false;
            generalt = vel.Next(tombhatar1, tombhatar2 + 1);
            for (int k = 0; k < tomb.GetLength(0); k++)
            {
              for (int l = 0; l < tomb.GetLength(1); l++)
              {
                if (generalt == tomb[k, l])
                {
                  talal = true;
                  break;
                }
              }
            }
          } while (talal);
          tomb[j, i] = generalt;
        }
      }
    }
    static void kiirat(ref int[,] tomb)
    {
      for (int j = 0; j < tomb.GetLength(0); j++)
      {
        for (int i = 0; i < tomb.GetLength(1); i++)
        {
          Console.Write("{0, 4} ", tomb[j, i]);
        }
        Console.WriteLine();
      }
    }
    static void Main(string[] args)
    {
      uint sorszam, oszlopszam;
      Console.Write("Adja meg a sorok számát: ");
      sorszam = Convert.ToUInt32(Console.ReadLine());
      Console.Write("Adja meg az oszlopok számát: ");
      oszlopszam = Convert.ToUInt32(Console.ReadLine());
      int[,] tomb = new int[sorszam, oszlopszam];
      Console.WriteLine();
      int tombhatar1 = 1, tombhatar2 = 600;
      Random vel = new Random();
      tombfeltolt(ref tomb, vel, ref tombhatar1, ref tombhatar2);
      kiirat(ref tomb);
      rendezes(ref tomb);
      Console.WriteLine();
      kiirat(ref tomb);
      Console.WriteLine();
      Console.ReadKey();
    }
  }
}