The code, which is developed in .NET framework, is known as managed code. This code is directly executed by
CLR with help of managed code execution. Any language that is written in .NET Framework is managed code.
Managed code uses CLR which in turns looks after your applications by managing memory, handling security,
allowing cross - language debugging, and so on.
The code, which is developed outside .NET, Framework is known as unmanaged code.
Applications that do not run under the control of the CLR are said to be unmanaged, and certain languages
such as C++ can be used to write such applications, which, for example, access low - level functions of
the operating system. Background compatibility with code of VB, ASP and COM are examples of unmanaged code.
Unmanaged code can be unmanaged source code and unmanaged compile code.
Unmanaged code is executed with help of wrapper classes.
Wrapper classes are of two types: CCW (COM Callable Wrapper) and RCW (Runtime Callable Wrapper).
Wrapper is used to cover difference with the help of CCW and RCW.