help need on calling dll

Question

hi.. i am developing an application in vb.net for pocket pc. my application need to call a dll..i have create that dll and import into my application. but when i run the pocket pc emulator for testing, it will be give me an exception saying that MissingMethodException it seems like it cannot find the method which i have import in by the dll.. i have tested out the dll i written in a simple vb.net application.. it is working fine.. is there a special method to import dll to the pocket pc?? or there is another method to create dll for pocket pc?? i try to add reference for that dll to my project.. but it give me an error saying that this is not a .NET assembly. Pls help...advice.. thks.. regards iceman11