RealtimeAnalysis.FormPRM.textBoxEmsPi_TextChanged C# (CSharp) Method

        private void textBoxEmsPi_TextChanged(object sender, EventArgs e)
        {            
            TextBox t = sender as TextBox;
            double pi = 1;

            try
            {
                pi = double.Parse(t.Text);
            }
            catch (FormatException fe)
            {
            }
            catch (Exception)
            {
                t.Text = "1";
                //MessageBox.Show("Invalid input!\r\nCheck your input again.", "Caution", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }
        }