Generics were firstly added to v 2.0 of the C#
language and the common language runtime (CLR). Generics represent to the .NET
Framework the concept of type parameters, which make it possible to design
classes and methods that defer the specification of one or more types until the
class or method is declared and instantiated by client code. For example, by
using a generic type parameter T you can write a single class that other
client code can use without incurring the cost or risk of runtime casts or
boxing operations, as shown here:
// declare...
