using System;

using System.Collections.Generic;

using System.Linq;

​

​

namespace ConsoleApplication1

{

    public class Employee

    {

        public int ID { get; set; }

        public string Name { get; set; }

        public List<Department> Departments { get; set; }

    }

​

    public class Department

    {

        public string Name { get; set; }

    }

​

    public class Program

    {

        public static void Main(string[] args)

        {

            List<Employee> employees = new List<Employee>();

            employees.Add(new Employee

            {

                ID = 1,

                Name = "Kapil",

                Departments = new List<Department>()

                {

                    new Department { Name = "Marketing" },

                    new Department { Name = "Sales"}

                }

            });

            employees.Add(new Employee

            {

                ID = 2,

                Name = "Raj",

                Departments = new List<Department>()

                {

                    new Department { Name = "Advertisement" },

                    new Department { Name = "Production"}

                }

            });

            employees.Add(new Employee

            {

                ID = 3,

                Name = "Ramesh",

                Departments = new List<Department>()

                {

                    new Department { Name = "Production" },

                    new Department { Name = "Sales"}

                }

            });

​

            var result = employees.SelectMany(w => w.Departments);

            foreach(var dept in result)

            {

                Console.WriteLine(dept.Name);

            }

        }

    }

}