WFA_psychometric_chart.Form_Psychrometric_Calculator.radioButton1_CheckedChanged C# (CSharp) Method

        private void radioButton1_CheckedChanged(object sender, EventArgs e)
        {
            //SI clicked
            unit_temp.Text = "Deg.C";
            unit_ap.Text = "HPa";
            unit_dp.Text = "Deg.C";
            unit_Pws.Text = "HPa";
            unit_mol_mass_over_mol_wt.Text = "g/kg";
            unit_mixed_gas_ratio.Text = "g/kg";
            unit_enthalpy.Text = "KJ/Kg";

            textBox1.Text = "";
            textBox2.Text = "";

            flagWhenFirstRadioClick = 1;
            if(flagForSecondRadioClick == 1)
            {
                //First second is clicked now need to be converted
                double pressureValue = double.Parse(tb_atm_pressure.Text);
                // double IP_pressure = 33.8639 * Patm;//in hpa now
                pressureValue =  pressureValue* 33.8639;// now this in in Hpa
                tb_atm_pressure.Text = pressureValue.ToString();
                flagForSecondRadioClick = 0;
            }

            if(tb_atm_pressure.Text == "")
            {
                //if empty then
                tb_atm_pressure.Text = "1013";
            }

            textBox1.Text = "";
            textBox2.Text = "";
            textBox4.Text = "";
            textBox8.Text = "";
            textBox10.Text = "";
            textBox11.Text = "";
            textBox9.Text = "";
        }