public partial class Form1 : Form
    {

        int rows = 2;
        int column = 2;

        int[,] matrix1 = new int[2, 2];
        int[,] matrix2 = new int[2, 2];
        int[,] matrix3 = new int[2, 2];

        public Form1()
        {
            InitializeComponent();
        }


        public int beräknaSumma()
        {

            for (int i = 0; i < rows; i++)
            {
                for (int j = 0; j < column; j++)
                {
                    int a = 0;
                    if (int.TryParse(box1.Text, box2.Text(j, i), out a))
                        matrix1[i, j] = a;

                }
            }

            for (int i = 0; i < rows; i++)
            {
                for (int j = 0; j < column; j++)
                {
                    int b = 0;
                    matrix2[rows, column] = b;
                }
            }

            for (int i = 0; i < rows ; i++)
            {
                for (int j = 0; j < column; j++)
                {
                    matrix3[rows, column] = matrix1[rows, column] + matrix2[rows, column];

                }
            }
            return beräknaSumma();

        }