[C#] 2D polja in metode

static void Swap(ref int[,] p, ref int[,] r)
        {
            int[,] temp;

            temp = p;
            p = r;
            r = temp;
        }

        static void Main(string[] args)
        {
            Console.WriteLine("Vpiši velikost polja1: ");
            int a = int.Parse(Console.ReadLine());
            Random rnd = new Random();
            int[,] p = new int[a, a];
            for (int i = 0; i < a; i++)
            {
                for (int j = 0; j < a; j++)
                {
                    p[i, j] = rnd.Next(1, 11);
                    Console.Write(p[i, j] +  " ");
                }
                Console.WriteLine();
            }
            Console.WriteLine("Vpiši velikost polja2: ");
            int b = int.Parse(Console.ReadLine());
            Random rnd2 = new Random();
            int[,] r = new int[b, b];
            for (int i = 0; i < b; i++)
            {
                for (int j = 0; j < b; j++)
                {
                    r[i, j] = rnd2.Next(1, 11);
                    Console.Write(r[i, j] + " ");
                }
                Console.WriteLine();
            }
            Swap(ref p, ref r);

            Console.WriteLine("\nSwapped output: ");
            for (int i = 0; i < p.GetLength(0); i++)
            {
                for (int j = 0; j < p.GetLength(0); j++)
                {
                    Console.Write(p[i, j] + " ");
                }
                Console.WriteLine();
            }
            Console.WriteLine("\nSwapped output: ");
            for (int i = 0; i < r.GetLength(0); i++)
            {
                for (int j = 0; j < r.GetLength(1); j++)
                {
                    Console.Write(r[i, j] + " ");
                }
                Console.WriteLine();
            }
            Console.ReadKey(true);
        }