• The prepackaged data-structure classes provided by the .NET Framework are known as collection classes—they store collections of data.
• With collection classes, instead of creating data structures to store these sets of items, the programmer simply uses existing data structures, without concern for how they’re implemented.
• The .NET Framework collections provide high-performance, high-quality implementations of common data structures and enable effective software reuse.
• In earlier versions of C#, the .NET Framework primarily provided the collection classes in the
System.Collections namespace to store and manipulate object references.
• The .NET Framework’s