我想在没有任何函数的C#中对矩阵进行升序排序

using System;

class Program
{
    static void Main()
    {
        int[,] matrix = {
            { 4, 2, 7 },
            { 1, 5, 3 },
            { 9, 6, 8 }
        };

        Console.WriteLine("原始矩阵：");
        PrintMatrix(matrix);

        SortMatrix(matrix);

        Console.WriteLine("升序排序后的矩阵：");
        PrintMatrix(matrix);
    }

    static void SortMatrix(int[,] matrix)
    {
        int rows = matrix.GetLength(0);
        int cols = matrix.GetLength(1);

        for (int i = 0; i < rows; i++)
        {
            for (int j = 0; j < cols; j++)
            {
                for (int k = 0; k < rows; k++)
                {
                    for (int l = 0; l < cols; l++)
                    {
                        if (matrix[i, j] < matrix[k, l])
                        {
                            int temp = matrix[i, j];
                            matrix[i, j] = matrix[k, l];
                            matrix[k, l] = temp;
                        }
                    }
                }
            }
        }
    }

    static void PrintMatrix(int[,] matrix)
    {
        int rows = matrix.GetLength(0);
        int cols = matrix.GetLength(1);

        for (int i = 0; i < rows; i++)
        {
            for (int j = 0; j < cols; j++)
            {
                Console.Write(matrix[i, j] + " ");
            }
            Console.WriteLine();
        }
        Console.WriteLine();
    }
}