How do you sort a generic list in C# and allow NULL items to appear first in the list?

public class Thing {
    public string Name { get; set; }
    public DateTime EditDate { get; set; }
}

var things = new List<Thing>();

thing.Sort((t1, t2) => t1.EditDate.CompareTo(t2.EditDate));

things.Sort((t1, t2) =>
{
 if (t1 == null)
 {
   return (t2 == null) ? 0 : -1;
 }
 if (t2 == null)
 {
   return 1;
 }
 return t1.EditDate.CompareTo(t2.EditDate);
});

TheList.Sort(int delegate(Type a, Type b)
{
    if (a.memeber == null) return -1;
    if (b.memeber == null) return 1;
    if (a.memeber<b.memeber) return -1;
    if (b.memeber<a.memeber) return 1;
    return 0;
}