Although interfaces in C# can have only properties, abstract classes in C# may have properties and fields. Typically, we use abstract classes to create an abstract base class that other classes ...

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 ...

Extension Method Basics 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# ...