using System;

using System.Linq;

using System.Net;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        //var lol = new Lolli() { Lol = "asd" };

        //ILol ilol = lol;

        List<Lolli> list = new List<Lolli>() { new Lolli() { Lol = "asd" } };

        List<ILol> ilist = list.Cast<ILol>().ToList();

        foreach(var el in ilist)

        {

            Console.WriteLine(el.Lol);

        }

    }

    public interface ILol {

        string Lol {get;set;}   

    }

    public class Lolli : ILol {

     public string Lol {get;set;}   

    }

}