Because string
type’s null
really points to nothing, there isn’t any object in memory.
But int?
type(nullable) even with value set to null
still points to some object.
If you read Jeffrey Richter’s “CLR via C#” you’ll find out that nullable type are just facade classes for common types with some incapsulated logics in order to make work with DB null more convenient.
Check msdn to learn about nullable types.