Suma de dos enteros

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 numero2

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

//Variables

int entrada1, entrada2, salida;

//Entrada

private void textBox1_TextChanged(object sender, EventArgs e)

{

entrada1 = int.Parse(textBox1.Text);

}

private void textBox2_TextChanged(object sender, EventArgs e)

{

entrada2 = int.Parse(textBox2.Text);

}

//Salida

private void button2_Click(object sender, EventArgs e)

{

salida = entrada1 + entrada2;

textBox3.Text = salida.ToString();

}

private void button1_Click(object sender, EventArgs e)

{

Application.Exit();

}

}

}