using System;

using System.Collections.Generic;

​

public class demo{

public int say=7;

//public static List<deneme> den= new List<deneme>();

public static deneme den;

}

​

public class deneme{

   public void yazdir(){

        Console.WriteLine("aa");

       }

}

​

public class Program

{

    public static void Main()

    {

   den.yazdir();

     Console.WriteLine();

    }

}