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

public class DateTimeComparer : IComparer
{
    #region IComparer Members

    public int Compare(DateTime? x, DateTime? y)
    {
        DateTime nx = x ?? DateTime.MaxValue;
        DateTime ny = y ?? DateTime.MaxValue;

        return nx.CompareTo(ny);
    }

    #endregion
}

No extra null checking is required.