In C#, what is the `?` in the type `DateTime?`
c#, nullable
Solution
The `?` makes it a nullable type (it's shorthand for the `Nullable<T>` Structure and is applicable to all value types).
Nullable Types (C#)
Note:
The `??` you linked to is the null coalescing operator which is completely different.
Problem
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.)