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?

[Lothar Haensler]

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