I developed one DLL in VC6 through win32 dll. Then i called this dll in vb6 and i got accurate result. No problem at all. Now i am trying to use this dll in vb.net but result is not accurate. The reason is vc6 produce unmanage dll that vb.net cannot use. Now i need to make Managed dll. Can you guide me step by step to make Managed Dll and send me small example for Managed DLL. Should i use VC6 or VC.net for Manage dll development. In the example use the function to get square of a number like below int squareMe(int x) { return (x*x); } Hope to get reply soon