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//Title of this code
//Rextester.Program.Main is the entry point for your code. Don't change it.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            List<DataObject> myList = new List<DataObject>(){
                    new DataObject{ TogetherId = 1, Id=1},
                    new DataObject{ TogetherId = 1, Id=2},
                    new DataObject{ TogetherId = 1, Id=16},
                    new DataObject{ TogetherId = 2, Id=7},
                    new DataObject{ TogetherId = 3, Id=8},
                    new DataObject{ TogetherId = 3, Id=9}
            };
            
            var newList = myList.GroupBy(x => x.TogetherId, x=> x.Id)
                .Select(x => new {
                      TogetherId = x.Key,
                      MaxId = x.Max()
                 })
                .ToList();
            
            foreach(var item in newList)
            {
                Console.WriteLine("{0}: {1}",item.TogetherId, item.MaxId);
            }
        }
    }
    
    public struct DataObject
    {
        public int TogetherId{get;set;}
        public int Id{get;set;}
    }
}

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Compilation time: 0.33 sec, absolute running time: 0.28 sec, cpu time: 0.27 sec, average memory usage: 18 Mb, average nr of threads: 5