New Features in C# 2.0—Express Null Values with Nullable Types

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Type-Safe List
Generic Collection
Collection Interfaces
Generic Iterators
Implement GetEnumerator
Anonymous Methods
Partial Types
Create Static Classes
Nullable Types
Global Namespace
Limit Properties Access
Co- and Contravariance

Express Null Values with Nullable Types

With new nullable types, you can assign value types a null value. This can be tremendously powerful, especially when working with databases where the value returned might be null; without nullable types you would have no way to express that an integer value is null, or that a Boolean is neither true nor false.

With nullable types, a value type such as bool or int can have the value null.