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Chapter 6. Working with Set Data > Introduction
Introduction
Set operations allow various functions to compare elements in collections (and in some cases, the same collection) against each other in order to determine overlapping and unique elements within a collection.
Framework libraries for set operations were missing in the .NET Framework 1, 2, and 3. The HashSet was introduced in .NET Framework 3.5, and this collection type solves most set problems often faced by developers. LINQ extended set function capability with specific operators, some of which overlap with HashSet functionality. It is important to understand the benefits of both strategies and when to choose one over another. This section looks in detail at the two main choices:
