Are there any reference sources for Windows API function declares (Pinvoke statements) in .NET, or VB.NET
With the SendMessage API I need to specify lparam as an object, but apparantly I'm not allowed because I get an 'unbalanced stack' error. Can I turn these off Do they really matter Advice or pointing me to some help material would be appreciated.

PInvoke, SendMessage API, etc.
phs-spop
http://www.pinvoke.net
Yes, errors matter so you shouldn't try to ignore them. Why do you have to use Object as the parameter type What are you actually passing in as the lParam argument