using System;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        SortedDictionary<int, object> genes = new SortedDictionary<int, object>();

        genes.Add(1, new object ());

        genes.Add(2, new object ());

        genes.Add(3, new object ());

        genes.Remove(2);

        genes.Add(4, new object ());

        foreach (var entry in genes)

        {

            Console.WriteLine("Current gene:{0}", entry.Key);

        }

    }

}