c#ta get ve set metodları:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication36
{

    class dörtgen
    {
        private int mEn;
        private int mBoy;

        public int En
        {
            get
            {
                return mEn;
            }
            set
            {
                if (value < 0)
                    mEn = 0;
                else
                    mEn = value;

            }
        }
        public int Boy
        {
            get
            {
                return mBoy;
            }
            set
            {
                if (value < 0)
                    mBoy = 0;
                else
                    mBoy = value;
            }
        }

        public int Alan()
        {


            int Alan = En * Boy;
        return Alan;



        }
    public void enboybelirle(int en, int boy)
    {
        if (en < 0 || boy < 0)
        {
            En = 0;
            Boy = 0;


        }
        else
        {
            En = en;
            Boy = boy;
        }


    }
    public void Yaz()
    {

        Console.WriteLine("*****************");
        Console.WriteLine("En : {0,5}", En);
        Console.WriteLine("Boy : {0,5}", Boy);
        Console.WriteLine("Alan : {0,5}", Alan());
        Console.WriteLine("*****************");

    }
}
class Program
{
    static void Main(string[] args)
    {
            dörtgen d1 = new dörtgen();
            d1.enboybelirle(20,50);
            d1.En = -50;
            Console.WriteLine(d1.En); 

    }
}
}