using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public class A

    {

        public string Id { get; set; }

        public string Name { get; set; }

    }

​

    public class B

    {

        public string Id { get; set; }

        public string Location { get; set; }

    }

​

    public class AB

    {

        public string Id { get; set; }

        public string Name { get; set; }

        public string Location { get; set; }

    }

    public static void Main()

    {

        var a1 = new A

        {

            Name = "XYZ",

            Id = "123"

        };

        var a2 = new A

        {

            Name = "UVW",

            Id = "567"

        };

        var aList = new List<A>()

        {

            a1,

            a2

        };

​

        var b1 = new B

        {

            Location = "US",

            Id = "123"

        };

        var b2 = new B

        {

            Location = "IN",

            Id = "567"

        };

        var bList = new List<B>()

        {

            b1,

            b2

        };

​

        var output = aList.Join(bList,

                                a => a.Id,

                                b => b.Id,

                                (a, b) => new AB

                                {

                                    Id = a.Id,

                                    Location = b.Location,

                                    Name = a.Name

                                }).ToList();

​

        foreach(var item in output)

        {

            Console.WriteLine(string.Format("Id : {0}, Name : {1}, Location:{1}", item.Id, item.Name, item.Location));

        }

    }

}