Take the 2-minute tour ×  This question already has an answer
here:  I just ran across some code while working with
System.DirectoryServices.AccountManagement  public DateTime?
LastLogon { get; }  What is the ? after the DateTime for.  I
found a reference for the ?? Operator (C# Reference), but it's
not the same thing. (280Z28: Here is the correct link for Using
Nullable Types.)  share|improve this question  marked as
duplicate by nawfal, George Duckett, Fox32, Roman C, Trinimon
May 20 '13 at 9:47   There are a lot of nullable types in C#
now. But be careful Null is not 0. –  TalkingCode Jan 15 '10 at
15:07 The link in your post is actually to the ?? operator,
which is the unrelated but very cool null coalescing operator.
–  Ian Robinson Jan 15 '10 at 15:07 Read section 4.1.10 of the
C# specification for details. –  Eric Lippert Jan 15 '10 at
15:08 @Charlie: I think it was a duplicate in sheep's clothing
until I reworded it in the title. –  Sam Harwell Jan 15 '10 at
15:21  6 Answers 6  up vote 27 down vote ac