Loops_09_MatrixOfNumbers

static void Main()
        {
            int num = int.Parse(Console.ReadLine());
            if (num > 0 && num < 21)
            {
                Console.Clear();
                int[,] matrix = new int[num, num];
                for (int row = 0; row < num; row++)
                {
                    for (int col = 0; col < num; col++)
                    {
                        if (row > 0)
                        {
                            matrix[row, col] = matrix[row - 1, col] + 1;
                        }
                        else
                        {
                            matrix[row, col] = col + 1;
                        }
                        Console.SetCursorPosition(row*3, col*2);
                        Console.Write(matrix[row, col]);
                    }
                    Console.WriteLine();
                }
            }
            else
            {
                Console.WriteLine("out of range");
            }
        }