Even I have the same problem. If anyone knows the solution please help me. The error I am getting is "There was an error generating the XML document".

Have you tried searching Google? There are a few articles here on CodeProject as well. Guys here don't like giving code without you doing your bit and showing what you have done. Treat Google as your friend. Excellence is doing ordinary things extraordinarily well.

That's doing it the hard way, but it works. Is this a COM-based .DLL (registered using REGSVR32) or a library .DLL?? COM-based .DLL's you can add a reference to and Visual Studio will automatically generate the wrapper for you, without using the command line to do it. A guide to posting questions on CodeProject[^] Dave Kreskowiak Microsoft MVP Visual Developer - Visual Basic      2006, 2007, 2008