Chunk/batch a list of items

Chunker.cs

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

public static class Extentions
{
    public static List<List<T>> ChunkBy<T>(this ICollection<T> source, int chunkSize)
    {
        return source
            .Select((x, i) => new { Index = i, Value = x })
            .GroupBy(x => x.Index / chunkSize)
            .Select(x => x.Select(v => v.Value).ToList())
            .ToList();
    }
}

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