using System;

using System.Collections.Generic;

using System.Linq;

namespace ConsoleApp1

{

    class Program

    {

        static void Main(string[] args)

        {

            var list = new List<Man>() { new Man(){Id = "",Name = "dds"},new Man(){Id = "",Name = "aisd"},new Man(){Id = "",Name = "232dfd"} };

            var keys = new List<string>(){"",""};

            var s = from m in list join key in keys on m.Id equals key select m ;

            var sel = list.Join(keys, i => i.Id, o => o, (m, n) => m);

            Console.WriteLine("Hello World!");

        }

    }

    class Man

    {

        public string Id { get; set; }

        public string Name { get; set; }

    }

}