How to split a list of integers to smaller chunks? [duplicate]

Answer 1

I suggest you to use Batch operator of MoreLINQ (available from NuGet):

IEnumerable> chuncks = list.Batch(9);

If you want list of lists, then you can create own extension:

public static List> Batch(this IEnumerable source, int batchSize)
{
    List> result = new List>();
    List batch = new List(batchSize);

    foreach(T item in source)
    {
        if (batch.Count == batchSize)
        {
            result.Add(batch);
            batch = new List(batchSize);                 
        }

        batch.Add(item);
    }

    if (batch.Any())
       result.Add(batch);

    return result;        
}

Your current implementation has big drawback - list.Skip(i) will enumerate source list from beginning for each batch you are adding to result.