Forex_Strategy_Builder.Calculator.TbxInput_KeyUp C# (CSharp) Method

        private void TbxInput_KeyUp(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Return)
                ParseInput(tbxInput.Text + "=");
            else if (e.KeyCode == Keys.Escape)
                tbxInput.Clear();
            else if (e.KeyCode == Keys.F1)
                MessageBox.Show(
                    Language.T("Write the mathematical expression in the box.") + Environment.NewLine +
                    Language.T("Enter the first number, the operator and the second number.") + Environment.NewLine +
                    Language.T("To see the result press a key or continue with the next operation.") + Environment.NewLine + Environment.NewLine +
                    Language.T("Addition")   + ": 12.34 + 8.8 =" + Environment.NewLine +
                    Language.T("Power")      + ": -5.3 ^ 2 ="    + Environment.NewLine +
                    Language.T("Percent")    + ": 2.2 * 125 %"   + Environment.NewLine + Environment.NewLine +
                    Language.T("Operations") + ": + - * / ^ %"   + Environment.NewLine + Environment.NewLine +
                    Language.T("Hot keys")   + ":" + Environment.NewLine + "   F1 - " +
                    Language.T("Help")       + Environment.NewLine + "   Esc - " +
                    Language.T("Clear")      + Environment.NewLine + "   F11 / F12 - " +
                    Language.T("Opacity")    + Environment.NewLine + "   (Alt + F4) - " +
                    Language.T("Exit"),
                    Language.T("Calculator Help"),
                    MessageBoxButtons.OK,
                    MessageBoxIcon.Information);
            else if (e.KeyCode == Keys.F11 && Opacity > 0.4f)
                Opacity -= 0.1f;
            else if (e.KeyCode == Keys.F12 && Opacity < 1.0f)
                Opacity += 0.1f;
            else
                ParseInput(tbxInput.Text);
        }