Splitting an array using LINQ

Question

I have a collection uni-dimensional like this:

[1,2,4,5.....n]

I would like to convert that collection in a bi-dimensional collection like

Answer 1

The sample below will split an array into groups of 4 items each.

int[] items = Enumerable.Range(1, 20).ToArray(); // Generate a test array to split
int[][] groupedItems = items
                         .Select((item, index) => index % 4 == 0 ? items.Skip(index).Take(4).ToArray() : null)
                         .Where(group => group != null)
                         .ToArray();