Machine Problem in C#

Create a C# program that accepts three numbers from the user and returns the average of the three numbers.

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Program Listing


 
// Machine Problem in C#
//
// Create a C# program that accepts three numbers from the user and returns the average of the three numbers.
// 
//  Mr. Jake Rodriguez Pomperada, MAED-IT, MIT
//  www.jakerpomperada.com
//  www.jakerpomperada.blogspot.com
//  jakerpomperada@gmail.com
//  Bacolod City, Negros Occidental

 
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();
        }

        public static double Average(double n1, double n2, double n3)
        {
            double avrg = (n1 + n2 + n3) / 3;
            return avrg;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            double num1, num2, num3;
            double avg;

            num1 = Convert.ToInt32(textBox1.Text);
            num2 = Convert.ToInt32(textBox2.Text);
            num3    = Convert.ToInt32(textBox2.Text);

            avg = Average(num1, num2, num3);

            textBox4.Text = avg.ToString("0.00");
        }

        private void button2_Click(object sender, EventArgs e)
        {
            textBox1.Text = "";
            textBox2.Text = "";
            textBox3.Text = "";
            textBox4.Text = "";
            textBox1.Focus();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            this.Close();
        }
    }
}