Interface - Delegate - Event - EventArgs - Event Handler - Anonymous Method
Thread - Thread Pool - Task - Timer - Parallel - Regex
Shallow Copy - Try Catch Finally - Operator Overloading - Boxing Unboxing - Abstract - Polymorphism
Exists - Ranking Functions - Row Number
File - Directory - FileInfo - DirectoryInfo - Path -FileStream - StreamReader - StreamWriter - TextReader - TextWriter - BinaryFormatter