soldierUnion

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Security.Cryptography;

namespace Uniting
{
    class Program
    {
        static void Main(string[] args)
        {
            List<Soldier> unitOne = new List<Soldier>
            {new Soldier ("Ivanov"),new Soldier ("Petrov"),new Soldier("Babaevskiy"),new Soldier("Sidorov"),new Soldier("Bolshoy")};

            List<Soldier> unitTwo = new List<Soldier>
            {new Soldier("Berezin"),new Soldier ("Putin"),new Soldier("Alexandrov"),new Soldier("Sviridov")};

            var filteredUnitOne = from Soldier soldier in unitOne
                                  where soldier.Name.StartsWith("B")
                                  select soldier;

            var result = unitTwo.Union(filteredUnitOne);

            foreach (var soldier in result)
            {
                Console.WriteLine(soldier.Name);
            }

        }

        class Soldier
        {
            public string Name { get; private set; }

            public Soldier(string name)
            {
                Name = name;
            }
        }
    }
}