using System;

using System.Collections.Generic;

using System.Configuration;

using System.Data.SqlClient;

using System.Linq;

​

        public class Record

        {

            public string Id;

            public string Value;

        }

​

        public class Records

        {

            public Record One;

            public Record Two;

            public Record Three;

        }

​

public class Program

{

    public static void Main()

    {

        var one = new List<Record>(){new Record(){Id = "one", Value = "1"},new Record(){Id = "two", Value = "2"}};

        var two = new List<Record>(){new Record(){Id = "one", Value = "1"},new Record(){Id = "two", Value = "2"}};

        var three = new List<Record>(){new Record(){Id = "one", Value = "1"},new Record(){Id = "two", Value = "2"}};

        var masters1 = one.Select(x => x.Id);

        var masters2 = two.Select(x => x.Id);

        var masters3 = three.Select(x => x.Id);

        if (masters1.Count() != masters1.Intersect(masters2).Count())

        {

            throw new Exception("one IDs did not match two IDs");

        }

        if (masters2.Count() != masters2.Intersect(masters3).Count())

        {

            throw new Exception("two IDs did not match three IDs");

        }

        var rv = new List<Records>();

        foreach (var master in masters1)

        {

            var record = new Records()

            {

                One = one.Single(x => x.Id == master),

                Two = two.Single(x => x.Id == master),

                Three = three.Single(x => x.Id == master),

            };

            rv.Add(record);

        }

        foreach(var x in rv){

            Console.WriteLine(x.One.Value); 

            Console.WriteLine(x.Two.Value); 

            Console.WriteLine(x.Three.Value);   

        }

    }

}