Fórum ➡ Get all combinations for ▶different◀ Id's ♦, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

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

// aljodav
// http://rextester.com/users/376

// in reply to the thread
// https://social.msdn.microsoft.com/Forums/WindowsServer/en-us/b12e4766-cd22-455d-9474-46c4b865dd45/help-needed-to-get-combinations-in-a-list-of-objects?forum=csharpgeneral
// which is similar to
// http://stackoverflow.com/questions/10519619/create-all-possible-combinations-of-items-in-a-list-using-linq-and-c-sharp

// NOTICE that the quantity of ▶different◀ Id's is, theoretically, UNLIMITED ( see the for-loop ).

namespace Rextester
{
    using LS=List<string>;
    using T2=Tuple<int,string>;
    using LT2=List<Tuple<int,string>>;
    class Program
    {
        static LT2 TheList(){
            return new LT2{
                new T2(3,"cotton"),
                new T2(3,"silk"),
                new T2(1,"red"),
                new T2(1,"blue"),
                new T2(2,"medium"),
                new T2(2,"small"),
                new T2(2,"large"),
                new T2(1,"green"),
            };
        }
        //  -----------------------------------------------------------------------
        
        public static void Main(string[] args)
        {
            /*▶*/LS target=new LS();
            
            for(int i=1;i<int.MaxValue;++i){ // --- --- --- --- --- --- --- ---
                
                var selected=TheList().Where(x=>x.Item1==i).Select(x=>x.Item2);
                if(0==selected.Count())break;
                if(i==1){target=selected.ToList();continue;}
                
                LS tmp=target;target=new LS();
                
                tmp.ForEach(x=>{
                    selected.ToList().ForEach(y=>target.Add(x+","+y));
                    //selected.Aggregate(target,(t,y)=>{t.Add(x+","+y);return t;});
                });
                
            } // --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- ---
            
            /*▶*/target.ForEach(Console.WriteLine);
            
            Console.WriteLine("\n\nHello, world!");
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,2 sec, absolute running time: 0,13 sec, cpu time: 0,11 sec, average memory usage: 14 Mb, average nr of threads: 3