Cannot find DLL entry point

I am trying to reference an exportable function in a DLL. I set up my API declaration and then when I call the function in an event get the following error message...

Cannot find DLL entry point (myfunction) in (mydll.dll)

I know the function is there and I know that it is spelled right. Anyone know whats going on?

Im a dummy... I forgot the API calls are case sensative!