[C#] Домашно Multidimensional Arrays - 1 Задача

//Write a program that fills and prints a matrix of size (n, n) as shown below: (examples for n = 4).

using System;
class FillsAndPrintsAMatrix
{
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());

        int[,] matrix;

        matrix=MatrixA(n);
        PrintMatrix(matrix);
        matrix = MatrixB(n);
        PrintMatrix(matrix);
        matrix = MatrixC(n);
        PrintMatrix(matrix);
    }
    static int[,]MatrixA(int n)
    {
        int[,] matrix = new int[n, n];
        for (int rows = 0; rows < matrix.GetLength(0); rows++)
        {
            int counter = rows;
            counter++;
            for (int col = 0; col < matrix.GetLength(1); col++, counter += n)
            {
                matrix[rows, col] = counter;
            }
        }
        return matrix;
    }
    static int[,]MatrixB(int n)
    {
        int[,] matrix = new int[n, n];
        for (int rows = 0; rows < matrix.GetLength(0); rows++)
        {
            int counter = rows;
            int counter2 = 0;
            counter++;
            for (int col = 0; col < matrix.GetLength(1); col++, counter += n)
            {
                if (col % 2 == 0)
                {
                    matrix[rows, col] = counter;
                }
                else
                {
                    counter2 = n * (col + 1);
                    counter2 -= rows;
                    matrix[rows, col] = counter2;
                }
            }
        }
        return matrix;
    }
    static int[,]MatrixC(int n)
    {
        int[,] matrix = new int[n, n];
        int counter = 1;
        for (int rows = matrix.GetLength(0) - 1; rows >= 0; rows--)
        {
            for (int col = 0; col < n - rows; col++)
            {
                matrix[(rows + col), col] = counter;
                counter++;
            }
        }
        for (int col = 1; col < matrix.GetLength(1); col++)
        {
            for (int rows = 0; rows < n - col; rows++)
            {
                matrix[rows, (rows + col)] = counter;
                counter++;
            }
        }
        return matrix;
    }
    static void PrintMatrix(int [,] matrix)
    {
        for (int rows = 0; rows < matrix.GetLength(0); rows++)
        {
            for (int col = 0; col < matrix.GetLength(1); col++)
            {
                Console.Write("{0,4}",matrix[rows,col]);
            }
            Console.WriteLine();
        }
        Console.WriteLine();
    }
}