Сложение матриц - C#

{
    class Program
    {
        static void Main(string[] args)
{
            double[,] N = { { 0, 1 }, { 1, 1 } };
            double[,] L = { { 2, 5 },{ 7, 4 } };
            double[,] res = Matrix.Plus(N, L);
            Console.WriteLine(string.Join(" ", res));
            Console.WriteLine(res);
            Console.ReadLine();
        }
    }
}
 
{
    class Matrix
    {
 public static double[,] Plus(double[,] N, double[,] L)
        {
            double[,] res = new double[N.GetLength(0), N.GetLength(0)];
            for (int row = 0; row < N.GetLength(0); row++)
            {
                for (int col = 0; col < N.GetLength(1); col++)
                {
                    res[row, col] = N[row, col] + L[row, col];
                }
            }
            return res;
        }
    }
}