Specified DLL function not found

I don't know why it doesn't find functoins in a dll.
Error says: Specified DLL function not found
I made VC++ Dll file to interact with vb interface.

I declared a function in the dll like this:

private Declare Function vbRegister
Lib "C:\Windows\Desktop\show_interface\serial.dll"
Alias "Register"
(byval hWnd as Long, byval nCommPort as Long, byval dwBaudRate as Long) as Long



at the form general declaration
Is there anything wrong you can think of?

I'd use DUMPBIN /EXPORTS (from VC++) to get a list of names of exported functions.
may be "Register" is not the exported name.