How To Multiple Of Two Value In Two Text Box Show Result In Third Textbox

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            System.Diagnostics.Process.Start("www.c-sharpcorner.com");
        }

        private void textBox3_TextChanged(object sender, EventArgs e)
        {
            try
            {
                textBox3.Text = (Decimal.Parse(textBox1.Text) * Decimal.Parse(textBox2.Text)).ToString();
            }

            catch
            {
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            textBox3.Text = (Decimal.Parse(textBox1.Text) * Decimal.Parse(textBox2.Text)).ToString();
        }
    }
}