C# - IComparer - If datetime is null then should be sorted to the bottom not the top

Question

I have a list of dates that I want to sort in an ascending order. However, the default comparer means that I have:

null
null
18/01/2011
23/01/2011

Answer 1

You could try this:

messages.Sort((x, y) => (x.CreatedOn ?? DateTime.MaxValue).CompareTo(y.CreatedOn ?? DateTime.MaxValue));