public static IEnumerable<IEnumerable<TValue>> Chunk<TValue>(this IEnumerable<TValue> values, Int32 chunkSize)
{
    // TODO: code that chunks
}

public static IEnumerable<IEnumerable<TValue>> Chunk<TValue>(this IEnumerable<TValue> values, Int32 chunkSize)
    {
        var count = values.Count();
        var numberOfFullChunks = count / chunkSize;
        var lastChunkSize = count % chunkSize;
        for (var chunkIndex = 0; chunkSize < numberOfFullChunks; chunkSize++)
        {
            yield return values.Skip(chunkSize * chunkIndex).Take(chunkSize);
        }
        if (lastChunkSize > 0)
        {
            yield return values.Skip(chunkSize * count).Take(lastChunkSize);
        }
    }

static class Ex
{
    public static IEnumerable<IEnumerable<TValue>> Chunk<TValue>(
        this IEnumerable<TValue> values,
        Int32 chunkSize)
    {
        return values
               .Select((v, i) => new {v, groupIndex = i / chunkSize})
               .GroupBy(x => x.groupIndex)
               .Select(g => g.Select(x => x.v));
    }
}

static class Ex
{
    public static IEnumerable<IEnumerable<TValue>> Chunk<TValue>(
                    this IEnumerable<TValue> values,
                    Int32 chunkSize)
    {
        using(var enumerator = values.GetEnumerator())
        {
            while(enumerator.MoveNext())
            {
                yield return GetChunk(enumerator, chunkSize).ToList();
            }
        }
    }
    private static IEnumerable<T> GetChunk<T>(
                     IEnumerator<T> enumerator,
                     int chunkSize)
    {
        do{
            yield return enumerator.Current;
        }while(--chunkSize > 0 && enumerator.MoveNext());
    }
}

public static IEnumerable<IEnumerable<TValue>> Chunk<TValue>(this IEnumerable<TValue> values, Int32 chunkSize)
{
    var valuesList = values.ToList();
    var count = valuesList.Count();
    for (var i = 0; i < (count / chunkSize) + (count % chunkSize == 0 ? 0 : 1); i++)
    {
        yield return valuesList.Skip(i * chunkSize).Take(chunkSize);
    }
}