Question

I have a field in my database that holds a DateTime?. I would like to sort the results so that the NULLs show up at the top, then descending by DateTime, e.g.,

null
null
2012-04-01
2012-01-01
2011-09-04

The reason is that I am looking at expiration dates, though some entries do not expire.

Answer 1

You can return DateTime.MaxValue instead of null from the ordering expression, so rows with null dates are sorted first:

yourData.OrderByDescending(row => row.dateTimeField ?? DateTime.MaxValue);