Check if any object in a 2d array is null

Question

I've got an array var cells = new Cell[w, h], can I loop through all cells without a nested for-loop (I want to check if at least one is null)? Ideally I'd want to write something like Debug.Assert(!cells.Contains(null)).

Answer 1

foreach loop ?

foreach (var item in cells)
{
    //code
}