C# includes several classes and interfaces that can help you query collections of data efficiently. The most commonly used interfaces for working with collections are IEnumerable, ICollection ...

Take advantage of read-only generic interfaces such as IReadOnlyList, IReadOnlyDictionary, and IReadOnlyCollection to prevent modifications to collections in your .NET Core applications.

Extension methods can be declared for any interface you want and will appear in the IntelliSense lists for any class that exposes that interface. Here, for example, in both C# and Visual Basic, is an ...