using System;

public class Program

{

    class MyClass

    {

        public int value;

        public MyClass(int v)

        {

            value=v;

        }

    }

    public static void Main()

    {

        int n = 6;

        MyClass[,] matrix=new MyClass[n,n];

        matrix[0,0]=new MyClass(10);

        matrix[0,1]=new MyClass(20);

        if(matrix[0,0]==null) Console.WriteLine("matrix[0,0] is null");

        else Console.WriteLine("matrix[0,0] is " + matrix[0,0].value);

    }

}