private void ThreeDigitSquarebtn_TryAgain_Click(object sender, EventArgs e)
        {
            ThreeDigitSquareAns1.Enabled = true;
            ThreeDigitSquareAns2.Enabled = true;
            ThreeDigitSquareAns3.Enabled = true;
            ThreeDigitSquareAns4.Enabled = true;
            ThreeDigitSquareAns1.Focus();

            ThreeDigitSquarebtn_TryAgain.Visible    = false;
            Trick_7_11_13_GroupBoxAnsLables.Visible = false;
            ThreeDigitSquareHintBox.Visible         = true;

            ClearControls();

            TrickThreeDigitSquarebtnCorrect1.Visible = true;
            TrickThreeDigitSquarebtnCorrect2.Visible = true;
            TrickThreeDigitSquarebtnCorrect3.Visible = true;
            TrickThreeDigitSquarebtnCorrect4.Visible = true;
            ThreeDigitSquarebtnIncorrect1.Visible    = true;
            ThreeDigitSquarebtnIncorrect2.Visible    = true;
            ThreeDigitSquarebtnIncorrect3.Visible    = true;
            ThreeDigitSquarebtnIncorrect4.Visible    = true;
            ThreeDigitSquarebtnLightBulb1.Visible    = true;
            ThreeDigitSquarebtnLightBulb2.Visible    = true;
            ThreeDigitSquarebtnLightBulb3.Visible    = true;
            ThreeDigitSquarebtnLightBulb4.Visible    = true;
            ThreeDigitSquarebtnSubmit.Visible        = true;

            InVisibleControls();
        }
        //To clear textbox controls and to set focus on the first text box
        void ClearControls()
        {
            ThreeDigitSquareAns1.Clear();
            ThreeDigitSquareAns2.Clear();
            ThreeDigitSquareAns3.Clear();
            ThreeDigitSquareAns4.Clear();

            ThreeDigitSquareAns1.Focus();
        }
 private void ThreeDigitSquare_Load(object sender, EventArgs e)
 {
     ThreeDigitSquareHintBox.Visible = true;
     InVisibleControls();
     ThreeDigitSquareAns1.Focus();
 }