using System;
using System.Collections.Generic;
using System.Linq;

namespace ConsoleApplication11 {
    class Program {
        static void Main(string[] args) {
            var items = Enumerable.Range(0, 33).ToList();

            Console.WriteLine("chunks1");
            var chunks1 = items.ToChunks(10);
            foreach (var chunk in chunks1)
                Console.WriteLine(string.Join(", ", chunk));

            Console.WriteLine("chunks2");
            var chunks2 = items.ToNChunks(9);
            foreach (var chunk in chunks2)
                Console.WriteLine(string.Join(", ", chunk));

            Console.ReadLine();
        }

    }
    public static class SeqExt {
        public static IEnumerable<List<T>> ToChunks<T>(this IEnumerable<T> items, int chunkSize) {
            List<T> chunk = new List<T>(chunkSize);
            foreach (var item in items) {
                chunk.Add(item);
                if (chunk.Count == chunkSize) {
                    yield return chunk;
                    chunk = new List<T>(chunkSize);
                }
            }
            if (chunk.Any())
                yield return chunk;
        }
        public static IEnumerable<List<T>> ToNChunks<T>(this IReadOnlyCollection<T> items, int chunksCount) {
            var chunkSize = items.Count / chunksCount;
            return items.ToChunks(chunkSize);
        }
    }
}