Fill the Matrix

/* Write two programs that fill and print a matrix of size N x N. Filling a matrix in the regular pattern (top to bottom and left to right) is boring. */

namespace _01.FillTheMatrix
{
    using System;

    class FillTheMatrix
    {
        static void Main(string[] args)
        {
            Console.Write("Enter a Positive Integer for size of matrix: ");
            int size = int.Parse(Console.ReadLine());

            Console.WriteLine(@"Please choose a type of the regular pattern to fill:
1 --> top to bottom
2 --> left to right
");
            int numChoice;
            do
            {
                Console.Write("Enter the number of your choice: ");
            } while (!int.TryParse(Console.ReadLine(), out numChoice) || numChoice < 1 || numChoice > 2);

            int[,] matrix = new int[size, size];
            FillTheMatrixByChoicenRegularPattern(matrix, numChoice);
            PrintTheMatrix(matrix);
        }

        private static void FillTheMatrixByChoicenRegularPattern(int[,] matrix, int pattern)
        {
            int n = matrix.GetLength(0);
            for (int row = 0; row < matrix.GetLength(0); row++)
            {
                for (int col = 0; col < matrix.GetLength(1); col++)
                {
                    if (pattern == 2 && col % 2 != 0)
                    {
                        matrix[row, col] = (n * (col + 1)) - row;
                    }
                    else
                    {
                        matrix[row, col] = (n * col) + row + 1;
                    }
                }
            }
        }

        private static void PrintTheMatrix(int[,] matrix)
        {
            Console.WriteLine("Your filled matrix is: ");
            Console.WriteLine();
            for (int row = 0; row < matrix.GetLength(0); row++)
            {
                for (int col = 0; col < matrix.GetLength(1); col++)
                {
                    Console.Write("{0,4}", matrix[row, col]);
                }
                Console.WriteLine();
            }
            Console.WriteLine();
        }
    }
}