C# LINQ with join on multiple properties

gistfile1.cs

namespace ConsoleApplication1
{
    public class Context
    {
        public IList<Product> Products { get; set; }
        public IList<Company> Companies { get; set; }
    }

    public class Product
    {
        public string Name { get; set; }
        public string MadeBy { get; set; }
        public int Id { get; set; }
        public int CompanyId { get; set; }
    }

    public class Company
    {
        public int CompanyId { get; set; }
        public string Country { get; set; }
        public string Name { get; set; }
    }

    class Program
    {
        static void Main(string[] args)
        {
            var ct = new Context()
            {
                Companies = new List<Company>()
                {
                    new Company()
                    {
                        CompanyId = 1,
                        Country = "VN",
                        Name = "C1"
                    },
                    new Company()
                    {
                        CompanyId = 2,
                        Country = "US",
                        Name = "C1"
                    }
                },
                Products = new List<Product>()
                {
                    new Product()
                    {
                        Id = 1,
                        Name = "P1",
                        MadeBy = "VN",
                        CompanyId = 1
                    }
                }
            };

            var query = from c in ct.Companies
                        join p in ct.Products on c.CompanyId equals p.CompanyId
                        select new { CompanyName = c.Name, ProductName = p.Name };

            var query2 = from c in ct.Companies
                         join p in ct.Products on new { c.CompanyId, c.Country } equals new { p.CompanyId, Country = p.MadeBy }
                         select new { CompanyName = c.Name, ProductName = p.Name };
        }
    }
}