4 işlemin metod türleri ile yapılması

dort_islem_metod.cs

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

        public void Topla()
        {
            int sayi1 = Convert.ToInt32(txt_sayi_1.Text);
            int sayi2 = Convert.ToInt32(txt_sayi_2.Text);
            int sonuc = sayi1 + sayi2;
            MessageBox.Show(sonuc.ToString());

        }
        public void Cikarma(int a, int b)
        {
            int sonuc = a + b;
            MessageBox.Show(sonuc.ToString());
        }

        public double Carpma()
        {
            double sayi1 = Convert.ToInt32(txt_sayi_1.Text);
            double sayi2 = Convert.ToInt32(txt_sayi_2.Text);
            double islem = sayi1 * sayi2;
            return islem;
        }
        public double Bolme(double a, double b)
        {
            double sonuc = a / b;
            return sonuc;
        }
        private void btn_topla_Click(object sender, EventArgs e)
        {
            Topla();
        }

        private void btn_cikar_Click(object sender, EventArgs e)
        {
            int sayi1 = Convert.ToInt32(txt_sayi_1.Text);
            int sayi2 = Convert.ToInt32(txt_sayi_2.Text);
            Cikarma(sayi1, sayi2);
        }

        private void btn_carpma_Click(object sender, EventArgs e)
        {
            string metin = Carpma().ToString();
            MessageBox.Show(metin);
        }

        private void btn_bolme_Click(object sender, EventArgs e)
        {
            double sayi1 = Convert.ToInt32(txt_sayi_1.Text);
            double sayi2 = Convert.ToInt32(txt_sayi_2.Text);

            string metin = Bolme(sayi1, sayi2).ToString();
            MessageBox.Show(metin);

        }
    }
}