using System;

using System.Collections.Generic;

using System.Linq;

​

public class Countries 

{

    public int Id { get; set; }

    public string Country { get; set; }

    public string Name { get; set; }

    public string Status { get; set; }

}

​

public class Details 

{

    public int Id { get; set; }

    public string Name { get; set; }

    public string Status { get; set; }

}

​

public class CountryList 

{

    public string Country { get; set; }

    public List<Details> Details { get; set; }

}

​

public class Program

{

    public static void Main()

    {

        var countries = new List<Countries>

        {

            new() { Id = 1, Country = "Uruguay", Name = "Foo", Status = "Completed" },

            new() { Id = 2, Country = "Uruguay", Name = "Foo", Status = "Completed" },

            new() { Id = 3, Country = "Germany", Name = "Foo", Status = "Completed" },

        };

        List<CountryList> countryList = countries

            .GroupBy(

                c => c.Country,

                ( country, matches ) => new CountryList()

                    {

                        Country = country,

                        Details = matches.Select(match => new Details 

                            { 

                                Id = match.Id, 

                                Name = match.Name, 

                                Status = match.Status 

                            }).ToList()

                    })

            .ToList();

        foreach (var countryGroup in countryList)

        {

            Console.WriteLine($"Country: {countryGroup.Country}");

            Console.WriteLine($"Details:");

            foreach (var detail in countryGroup.Details)

            {

                Console.WriteLine($"\tId: {detail.Id}");

                Console.WriteLine($"\tName: {detail.Name}");

                Console.WriteLine($"\tStatus: {detail.Status}");

                Console.WriteLine("\t-----");

            }

        }

    }

}