A delegate object encapsulates a reference to a method.
    A delegate in C# is similar to a function pointer in C or C++. Using a delegate allows the programmer to encapsulate a reference to a method inside a delegate object. The delegate object can then be passed to code which can call the referenced method, without having to know at compile time which method will be invoked.

A delegate that has multiple handlers assigned to it.  Each assigned handler (method) is called.
  A multicast delegate maintains a list of functions that will all be called when the delegate is invoked. We can add back in the logging function and call both delegates.

Assembly versioning allows the application to specify not only the library it needs to run (which was available under Win32), but also the version of the assembly.

An MSI installer, a CAB archive, and XCOPY command.

When you write a multilingual or multi-cultural application in .NET, and want to distribute the core application separately from the localized modules, the localized assemblies that modify the core application are called satellite assemblies.

System.Globalization and System.Resources.

An Assembly

As a good rule, you should not call the garbage collector. However, you could call the garbage collector when you are done using a large object (or set of objects) to force the garbage collector to dispose of those very large objects from memory. However, this is usually not a good practice.

Use Boxing