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Answer Posted / jayakumar
Managed code is code that is written to target the services
of the Common Language Runtime.
In order to target these services, the code must provide a
minimum level of information (metadata) to the runtime.
All C#, Visual Basic .NET, and JScript .NET code is managed
by default.
Visual Studio .NET C++ code is not managed by default, but
the compiler can produce managed code by specifying a
command-line switch (/CLR).
Closely related to managed code is managed data--data that
is allocated and de- allocated by the Common Language
Runtime's garbage collector. C#, Visual Basic, and JScript
.NET data is managed by default.
C# data can, however, be marked as unmanaged through the use
of special keywords.
Visual Studio .NET C++ data is unmanaged by default (even
when using the /CLR switch), but when using Managed
Extensions for C++, a class can be marked as managed using
the __gc keyword. As the name suggests, this means that the
memory for instances of the class is managed by the garbage
collector.
In addition, the class becomes a full participating member
of the .NET Framework community, with the benefits and
restrictions that it brings. An example of a benefit is
proper interoperability with classes written in other
languages (for example, a managed C++ class can inherit from
a Visual Basic class).
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