Write a program in C# for design a form to use all arithmetic operations using textboxes and buttons

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

namespace Wprg2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            int c = int.Parse(textBox1.Text) + int.Parse(textBox2.Text);
            textBox3.Text = Convert.ToString(c);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            int c = int.Parse(textBox1.Text) - int.Parse(textBox2.Text);
            textBox3.Text = Convert.ToString(c);
        }

        private void button3_Click(object sender, EventArgs e)
        {
            int c = int.Parse(textBox1.Text) * int.Parse(textBox2.Text);
            textBox3.Text = Convert.ToString(c);
        }

        private void button4_Click(object sender, EventArgs e)
        {
            int c = int.Parse(textBox1.Text) / int.Parse(textBox2.Text);
            textBox3.Text = Convert.ToString(c);}}
        }