private void DisplayThirdLevel()
{
B2.Clear();
B3.Clear();
B3.ReadOnly = false;
B5.Clear();
B7.Clear();
B8.Clear();
B10.Clear();
B11.Clear();
B11.ReadOnly = false;
B13.Clear();
B14.Clear();
B14.ReadOnly = false;
B15.Clear();
B16.Clear();
B4.Text = "2";
B4.ReadOnly = true;
B12.Text = "1";
B12.ReadOnly = true;
}
private void DisplaySecondLevel()
{
B2.Clear();
B8.Clear();
B8.ReadOnly = false;
B12.Clear();
B13.Clear();
B15.Clear();
B16.Clear();
B16.ReadOnly = false;
B3.Text = "3";
B3.ReadOnly = true;
B4.Clear();
B4.ReadOnly = false;
B5.Clear();
B5.ReadOnly = false;
B6.Text = "2";
B6.ReadOnly = true;
B7.Clear();
B7.ReadOnly = false;
B9.Text = "4";
B9.ReadOnly = true;
B10.Clear();
B10.ReadOnly = false;
B14.Text = "1";
B14.ReadOnly = true;
}