hi
sohan singh
native code is cpu dependent and managed code  target to clr

The code, which targets  clr is called as managed code.
managed code that does not have any providers .it is very 
fast than unmanaged code.

If you want to prevent your program from being cracked by 
hackers, you can use native code. You can cipher/decipher 
this code, or it may be self-modifying code for more 
safety.

When the complier translates, it translates the .net source 
code into MSIL (Microsoft Intermediate Language) which is 
known as managed code. These managed code is the CPU - 
independent set of instructions which is later converted 
into native code (i.e CPU dependent) by the JIT ( Just In-
time) compiler before execution.

Native code is CPU dependent 
Managed Code is when the code is inside the CLR .

Native code is computer programming (code) that is compiled
to run with a particular processor (such as an Intel
x86-class processor) and its set of instructions. If the
same program is run on a computer with a different
processor, software can be provided so that the computer
emulates the original processor. In this case, the original
program runs in "emulation mode" on the new processor and
almost certainly more slowly than in native mode on the
original processor. (The program can be rewritten and
recompiled so that it runs on the new processor in native mode.)

Native code can also be distinguished from bytecode
(sometimes called interpreted code), a form of code that can
be said to run in a virtual machine (for example, the Java
virtual machine). The virtual machine is a program that
converts the platform-generalized bytecode into the native
code that will run in a specific processor. Microsoft's .NET
compilers for its Visual Basic, C#, and JavaScript languages
produce bytecode (which Microsoft calls Intermediate
Language). Java bytecode and Microsoft's Intermediate
Language can be compiled into native code before execution
by a just-in-time compiler for faster performance.