Summary
Interfaces in C# allow the development of classes that can share features but that are not part of the same class hierarchy. Interfaces play a special role in C# development because C# doesn't support multiple inheritance. To share semantically related methods and properties, classes can implement multiple interfaces. Also, the is and as operators can be used to determine whether a particular interface is implemented by an object, which can help prevent errors associated with using interface members. Finally, explicit member naming and name hiding can be used to control interface implementation and to help prevent errors.