using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace ConsoleApplication8{    class pr    {        public int Id { get; set; }        public string Name { get; set; }        public string Name2 { get; set; }    }    class Program    {        static void Main(string[] args)        {            List
     
       prarr = new List
      
        {                new pr() { Id = 1, Name = "A" },                new pr() { Id = 2, Name = "B" },                new pr() { Id = 3, Name = "C" },                new pr() { Id = 4, Name = "D" },                new pr() { Id = 4, Name = "D" },            };            var lista_ = prarr.Select(a => new { a.Id, a.Name });            var sdsds = lista_.GroupBy(a => a.Name).Select(G => new            {                G.Key,                ID = G.Sum(item => item.Id)            });            Console.WriteLine();            //var list1 = new { Id = 1, Name = "asd1" };            //var list2 = new { Id = 2, Name = "asd2" };            //var list3 = new { Id = 3, Name = "asd3" };            //var list4 = new { Id = 4, Name = "asd4" };            //var list5 = new { Id = 4, Name = "asd4" };            //var list = new {new            //                { Id = 1, Name = "asd1" } ,            //               new { Id = 2, Name = "asd2" },            //               new { Id = 3, Name = "asd3" },            //              new  { Id = 4, Name = "asd4" },            //                new { Id = 4, Name = "asd4" }            //           };        }    }}