Grid Array

Program.cs

using System;

namespace GridArray
{
    class Program
    {
        static void Main()
        {
            int[,] grid = new int[5, 4] { { 1, 2, 3, 4 }, { 5, 6, 7, 8 }, { 9, 10, 11, 12 }, { 13, 14, 15, 16 }, { 17, 18, 19, 20 } };

            int rows = grid.GetLength(0);
            int columns = grid.GetLength(1);

            for (int i = 0; i < rows; i++)
            {
                for (int j = 0; j < columns; j++)
                {
                    Console.Write(string.Format("{0:D2} ", grid[i, j]));
                }
                Console.Write("\n\n");
            }
            Console.ReadKey();
        }
    }
}