RealtimeAnalysis.FormPRM.textBoxPi_TextChanged C# (CSharp) Method

        private void textBoxPi_TextChanged(object sender, EventArgs e)
        {
            try
            {
                _PI = double.Parse(textBoxPi.Text);
            }
            catch (FormatException fe)
            {
            }
            catch (Exception)
            {
                _PI = 1;
                textBoxPi.Text = "1";
                //MessageBox.Show("Invalid input!\r\nCheck your input again.", "Caution", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }

            if (comboBoxTaskSet.SelectedItem.ToString() == "EMS")
                textBoxEmsPi.Text = _PI.ToString();
            else
                textBoxTmsPi.Text = _PI.ToString();
        }
        private void textBoxIncrementUnit_TextChanged(object sender, EventArgs e)