Question

Last day I have been interviewed and the interviewer asked me

a) what is dotnet Modules?

b) What is the new dynamic keyword and what is it’s use(dot net 4.0)

c) what is the difference between dynamic keyword and var(dotnet 3.5+)

d) What is the difference between Var & Object? Why should we use one over another?

Could anyone be kind enough in answering this.

Thanks.

Answer 1

From Module Statement

Modules are a reference type similar
to classes, but with some important
distinctions. The members of a module
are implicitly Shared and scoped to
the declaration space of the standard
module’s containing namespace, rather
than just to the module itself. Unlike
classes, modules can never be
instantiated, do not support
inheritance, and cannot implement
interfaces. A module can only be
declared in a namespace and cannot be
nested in another type.

From dynamic (C# Reference)

The dynamic type enables the
operations in which it occurs to
bypass compile-time type checking.
Instead, these operations are resolved
at run time. The type simplifies
access to COM APIs such as the Office
Automation APIs, and also to dynamic
APIs such as IronPython libraries, and
to the HTML Document Object Model
(DOM).

And [c#] dynamic vs var