1-) C# - geriye donduren metotlar ornek

using System;

using System.Windows.Forms;

namespace geriye_donduren_metotlar

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        dikdortgen dik = new dikdortgen();

        private void button1_Click(object sender, EventArgs e)

        {

            double yakala = dik.kareAlan(2);

            Console.WriteLine(yakala);

        }

        private void button2_Click(object sender, EventArgs e)

        {

            double yakala = dik.dikalan(2, 5);

            Console.WriteLine(yakala);

        }

    }

}

add clas <<

namespace geriye_donduren_metotlar

{

    class dikdortgen

    {

        public double kareAlan(int a)

        {

            double sonuc = a * a;

            return sonuc;

        }

        public double dikalan(int a, int b)

        {

            double sonuc = a * b;

            return sonuc;

        }

    }

}