what should be the code for addition of two nos?

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C#

I have to write the code on button click for addition of two nos.

Can anyone tell why the code given below is not working?

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

        private void button1_Click(object sender, EventArgs e)
        {
            int number1;
            int number2;
            int answer;



number1 = 3;
number2 = 5;

answer = number1 + number2;

//MsgBox(answer);


        }
    }