In the C# programming language, extension methods enable you to extend the functionality of existing types without modifying them or deriving new types from them using inheritance. You don’t ...

Until C# 8.0, an interface in C# could not contain method definitions. You could only include method declarations in an interface, and the members of an interface were public and abstract by default.

C# System.Threading.Timer - TimerCallback delegate is never called, it seems. ... several method calls retrieve things and sort things and read from and write to a database.