using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        List<int> ages = new List<int>(){1,2,3,4,5,6,7,8,9,10};

        var batchedAges = ages.Batch(2); // expecting list of {{1,2},{3,4}...}

        var test = batchedAges.ToList();

    }

}

​

public static class Util

{

    public static IEnumerable<List<TSource>> Batch<TSource>(this IEnumerable<TSource> source, int size)

    {

        List<TSource> bucket = null;

        int count = 0;

​

        foreach (TSource item in source)

        {

            if (bucket == null)

                bucket = new List<TSource>(size);

​

            bucket[count++] = item;

​

            if (count != size)

                continue;

​

            yield return bucket;

​

            bucket = null;

            count = 0;

        }

​

        if (bucket != null && count > 0)

            yield return bucket.Take(count).ToList();

    }

}