How we compile code in C\C++ to DLL file?

Hi all!

I am new comer in this forum.
i wander that can we compile code in c\c++ to library file(.dll) or not.
after we get dll file this dll file can we use in the any language (like vb.net etc.)

How we compile code in C/C++ to dll file?
Please give me some code example.

Best regards,
Thirith.

Search the board. It has been asked so often.