You can use the following self-help information resources and tools to help you troubleshoot problems:

HCL Z and I Emulator for Windows .NET Interop assemblies fail to trigger session OIA notifications

.NET applications which register for OIA event notifications are not notified of these events. Also several methods of corresponding COM type library are not shown by Visual studio's intellisense feature.
.NET Interop assemblies are derived from corresponding COM type library using the tool TlbImp.exe shipped with Microsoft SDK. The Type Library Importer converts the type definitions found within a COM type library into equivalent definitions in a common language runtime assembly. The runtime marshaler however cannot marshal all the data types. Therefore some COM type library definitions are not found in the resulting common language runtime assembly.
This is a limitation of TlbImp.exe.