int[,] tabMnozenia = new int[10, 10];
                        for (int i = 0; i <= 9; i++)
            {
                for (int j = 0; j <= 9; j++)
                {
                    tabMnozenia[i, j] = (i + 1) * (j + 1);
                }
            }

            for (int i = 0; i <= 9; i++)
            {
                for (int j = 0; j <= 9; j++)
                {
                    txt2D.Text += Convert.ToString(tabMnozenia[i, j]) + "\t";
                }

                txt2D.Text += "\r\n";
            }
        }