InfoPath Dev

I found out this works.In an assembly HostAPI is this: [ComVisible(true)] [Serializable()] public class HostAPI{       public void Save()       {             MessageBox.Show("HostAPI - Save()");       } ...

Hi,   I’m creating a Windows Form Application that hosts an InfoPath Form Control. The InfoPath Form has to be able to call methods in the host application. This should work by passing an object to the InfoPath FormControl Host Property. I don’t get this to work. I always get an InvalidCastException without any details.   What are ...