using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace ConsoleApplication1

{

    class Program

    {

        static void Main(string[] args)

        {

            List<strudent> one = new List<strudent>();

            one.Add(new strudent() { age = , name = "aaa" });

            one.Add(new strudent() { age = , name = "bbb" });

            one.Add(new strudent() { age = , name = "ddd" });

            one.Add(new strudent() { age = , name = "fff" });

            one.Add(new strudent() { age = , name = "ggg" });

            one.Add(new strudent() { age = , name = "eee" });

            List<strudent> two = new List<strudent>();

            two.Add(new strudent() { age = , name = "aaa" });

            two.Add(new strudent() { age = , name = "bbb" });

            two.Add(new strudent() { age = , name = "ddd" });

            two.Add(new strudent() { age = , name = "fff" });

            two.Add(new strudent() { age = , name = "ggg" });

            two.Add(new strudent() { age = , name = "eee" });

            two.Add(new strudent() { age = , name = "aaaaa" });

            var tt = one.Union(two).ToList();

            var res = from p in tt

                      group p by new { p.name } into g

                      select new { name = g.Key.name, accp = g.Sum(p => p.age) };

            tt.ForEach(x =>

            {

                Console.WriteLine(x.name + "     " + x.age);

            });

            Console.ReadKey();

        }

    }

    public class strudent

    {

        public decimal age { get; set; }

        public string name { get; set; }

    }

    public class StudentListEquality : IEqualityComparer<strudent>

    {

        public bool Equals(strudent x, strudent y)

        {

            return x.name == y.name;

        }

        public decimal sum(strudent x, strudent y)

        {

            if (x.name == y.name)

            {

                return x.age + y.age;

            }

            return ;

        }

        public int GetHashCode(strudent obj)

        {

            if (obj == null)

            {

                return ;

            }

            else

            {

                return obj.ToString().GetHashCode();

            }

        }

    }

}