General recursive extension method:
public static IEnumerable<IEnumerable<T>> SplitList<T>(this IEnumerable<T> source, int maxPerList)
{
var enumerable = source as IList<T> ?? source.ToList();
if (!enumerable.Any())
{
return new List<IEnumerable<T>>();
}
return (new List<IEnumerable<T>>() { enumerable.Take(maxPerList) }).Concat(enumerable.Skip(maxPerList).SplitList<T>(maxPerList));
}