private void statyczneToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            int[,] TabMnożenia = new int[10, 10];
            for (int i = 0; i <= 9; i++)
            {
                for (int j = 0; j <= 9; j++)
                {
                    TabMnożenia[i, j] = (i + 1) * (j + 1);
                }
            }
            {
                for (int i = 0; i <= 9; i++)
                {
                    for (int j = 0; j <= 9; j++)
                        txt2D.Text += Convert.ToString(TabMnożenia[i, j]) + "\t";
                }
                txt2D.Text += "\r\n";
            }
        }