private void Add_btn_Click(object sender, EventArgs e)
{
Op_lbl.Text = Add_btn.Text;
Lhs_lbl.Text = textBox1.Text;
Tape_txtBox.AppendText(Lhs_lbl.Text + "\n");
textBox1.Clear();
calc.Addition_entered();
}
private void Add_Click(object sender, EventArgs e)
{
string numberEntered = calculator.Number_entered(Convert.ToDouble(display.Text));
resultValue += numberEntered;
display.Text = calculator.Addition_entered();
isNewNumberEntered = true;
temp_History += display.Text + "+";
}